diff --git a/mc_openapi/__main__.py b/mc_openapi/__main__.py
index 7d04f2fee0db4692e5c32c7a2245f3d11cefcd9b..42877c0d2501d435bb5d2555e8956b4049c89197 100644
--- a/mc_openapi/__main__.py
+++ b/mc_openapi/__main__.py
@@ -103,7 +103,7 @@ else:
             print("Failed to parse the DOMLR.", file=sys.stderr)
             exit(-1)
 
-    if doml_ver == DOMLVersion.V2_2:
+    if doml_ver == DOMLVersion.V2_2 or doml_ver == DOMLVersion.V2_2_1:
         model = get_pyecore_model(doml_xmi, doml_ver)
         func_reqs = model.functionalRequirements.items
         for req in func_reqs:
diff --git a/mc_openapi/doml_mc/imc.py b/mc_openapi/doml_mc/imc.py
index 3bab3f156537e1cd46cd7ed0498711895d2c213b..90cb8367f9349bf2b2aa119332aa33c9a5431f0b 100644
--- a/mc_openapi/doml_mc/imc.py
+++ b/mc_openapi/doml_mc/imc.py
@@ -172,6 +172,5 @@ class IntermediateModelChecker:
             ))
             self.solver.pop()
 
-        stats = self.solver.statistics()
-        STATS.add(stats)
+        # stats = self.solver.statistics()
         return MCResults(results)
diff --git a/tests/doml/v2.2/nginx_func_req.domlx b/tests/doml/v2.2/nginx_func_req.domlx
index f0f4e5af2424f404c8532f60487286bcf46367fb..5de0b46c4eec6bf1f1f466f72579750e22cfc2d9 100644
--- a/tests/doml/v2.2/nginx_func_req.domlx
+++ b/tests/doml/v2.2/nginx_func_req.domlx
@@ -55,5 +55,5 @@
   <configurations name="conf">
     <deployments component="//@application/@components.0" node="//@infrastructure/@groups.0/@machineDefinition"/>
   </configurations>
-  <functionalRequirements name="req_ext" description="+ &quot;All Virtual Machines have a Interface and at least 4 CPUs&quot; forall vm (vm is class abstract.VirtualMachine implies exists iface (vm has abstract.ComputingNode.ifaces iface and vm has abstract.ComputingNode.cpu_count >= 4 )) error: &quot;A vm does lacks an associated interface or has less than 4 CPUs&quot;"/>
+  <functionalRequirements name="req_ext" description="```&#xA;&#xA; + &quot;VM must have iface and iface is connected to network&quot;&#xA; &#x9;forall vm (&#xA; &#x9;&#x9;vm is class abstract.VirtualMachine&#xA;    &#x9;implies&#xA;        (&#xA;        &#x9;vm has abstract.ComputingNode.ifaces iface&#xA;        &#x9;and&#xA;        &#x9;iface has abstract.NetworkInterface.belongsTo net&#xA;        )&#xA;    )&#xA; error: &quot;TEST ERROR&quot;&#xA; &#xA; ```"/>
 </commons:DOMLModel>
diff --git a/tests/doml/v2.2/nginx_func_req2_unsat.domlx b/tests/doml/v2.2/nginx_func_req2_unsat.domlx
new file mode 100644
index 0000000000000000000000000000000000000000..ab00f04895723cb0d57cd329588537d0c45a97ac
--- /dev/null
+++ b/tests/doml/v2.2/nginx_func_req2_unsat.domlx
@@ -0,0 +1,59 @@
+<?xml version="1.0" encoding="ASCII"?>
+<commons:DOMLModel xmi:version="2.0" xmlns:xmi="http://www.omg.org/XMI" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:app="http://www.piacere-project.eu/doml/application" xmlns:commons="http://www.piacere-project.eu/doml/commons" xmlns:infra="http://www.piacere-project.eu/doml/infrastructure" xmlns:optimization="http://www.piacere-project.eu/doml/optimization" name="nginx_func_req" activeConfiguration="//@configurations.0" activeInfrastructure="//@concretizations.0">
+  <application name="app">
+    <components xsi:type="app:SoftwareComponent" name="nginx">
+      <annotations xsi:type="commons:SProperty" key="source_code" value="/usr/share/nginx/html/index.html"/>
+    </components>
+  </application>
+  <infrastructure name="infra">
+    <generators xsi:type="infra:VMImage" name="vm_img" uri="ami-xxxxxxxxxxxxxxxxx" kind="IMAGE" generatedVMs="//@infrastructure/@groups.0/@machineDefinition"/>
+    <credentials xsi:type="commons:KeyPair" name="ssh_key" user="ec2-user" keyfile="/tmp/ssh_key_file" algorithm="RSA" bits="4096"/>
+    <groups xsi:type="infra:AutoScalingGroup" name="ag">
+      <machineDefinition name="vm1" credentials="//@infrastructure/@credentials.0" generatedFrom="//@infrastructure/@generators.0">
+        <ifaces name="i1" endPoint="10.0.0.1" associated="//@infrastructure/@securityGroups.0"/>
+        <location region="eu-central-1"/>
+      </machineDefinition>
+    </groups>
+    <securityGroups name="sg" ifaces="//@infrastructure/@groups.0/@machineDefinition/@ifaces.0">
+      <rules name="icmp" protocol="icmp" fromPort="-1" toPort="-1">
+        <cidr>0.0.0.0/0</cidr>
+      </rules>
+      <rules name="http" kind="INGRESS" protocol="tcp" fromPort="80" toPort="80">
+        <cidr>0.0.0.0/0</cidr>
+      </rules>
+      <rules name="https" kind="INGRESS" protocol="tcp" fromPort="443" toPort="443">
+        <cidr>0.0.0.0/0</cidr>
+      </rules>
+      <rules name="ssh" kind="INGRESS" protocol="tcp" fromPort="22" toPort="22">
+        <cidr>0.0.0.0/0</cidr>
+      </rules>
+    </securityGroups>
+    <networks name="vpc" protocol="tcp/ip" addressRange="/24">
+      <subnets name="vpc_subnet" protocol="tcp/ip" addressRange="/24"/>
+    </networks>
+  </infrastructure>
+  <concretizations name="con_infra">
+    <providers name="aws">
+      <vms name="ec2_vm" maps="//@infrastructure/@groups.0/@machineDefinition">
+        <annotations xsi:type="commons:SProperty" key="vm_name" value="nginx-host"/>
+        <annotations xsi:type="commons:SProperty" key="instance_type" value="t2.micro"/>
+        <annotations xsi:type="commons:SProperty" key="ssh_key_name" value="demo-key"/>
+        <annotations xsi:type="commons:SProperty" key="ec2_role_name" value="demo-ec2-role"/>
+      </vms>
+      <vmImages name="concrete_vm_image" maps="//@infrastructure/@generators.0"/>
+      <networks name="concrete_net" maps="//@infrastructure/@networks.0">
+        <annotations xsi:type="commons:SProperty" key="vm_name" value="nginx-host"/>
+      </networks>
+    </providers>
+  </concretizations>
+  <optimization name="opt">
+    <objectives xsi:type="optimization:MeasurableObjective" kind="min" property="cost"/>
+    <objectives xsi:type="optimization:MeasurableObjective" kind="max" property="availability"/>
+    <nonfunctionalRequirements xsi:type="commons:RangedRequirement" name="req1" description="Cost &lt;= 70.0" property="cost" max="70.0"/>
+    <nonfunctionalRequirements xsi:type="commons:RangedRequirement" name="req2" description="Availability >= 66.5%" property="availability" min="66.5"/>
+  </optimization>
+  <configurations name="conf">
+    <deployments component="//@application/@components.0" node="//@infrastructure/@groups.0/@machineDefinition"/>
+  </configurations>
+  <functionalRequirements name="req_ext" description="```&#xA;&#xA; + &quot;VM must have iface and iface is connected to network&quot;&#xA; &#x9;forall vm (&#xA; &#x9;&#x9;vm is class abstract.VirtualMachine&#xA;    &#x9;implies&#xA;        (&#xA;        &#x9;vm has abstract.ComputingNode.ifaces iface&#xA;        &#x9;and&#xA;        &#x9;iface has abstract.NetworkInterface.belongsTo net&#xA;        )&#xA;    )&#xA; error: &quot;TEST ERROR&quot;&#xA; &#xA; ```"/>
+</commons:DOMLModel>
diff --git a/tests/doml/v2.2/nginx_func_req2_unsat_neg.domlx b/tests/doml/v2.2/nginx_func_req2_unsat_neg.domlx
new file mode 100644
index 0000000000000000000000000000000000000000..e577a79eccc03adce5be21f56ce4495894f39b2d
--- /dev/null
+++ b/tests/doml/v2.2/nginx_func_req2_unsat_neg.domlx
@@ -0,0 +1,59 @@
+<?xml version="1.0" encoding="ASCII"?>
+<commons:DOMLModel xmi:version="2.0" xmlns:xmi="http://www.omg.org/XMI" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:app="http://www.piacere-project.eu/doml/application" xmlns:commons="http://www.piacere-project.eu/doml/commons" xmlns:infra="http://www.piacere-project.eu/doml/infrastructure" xmlns:optimization="http://www.piacere-project.eu/doml/optimization" name="nginx_func_req" activeConfiguration="//@configurations.0" activeInfrastructure="//@concretizations.0">
+  <application name="app">
+    <components xsi:type="app:SoftwareComponent" name="nginx">
+      <annotations xsi:type="commons:SProperty" key="source_code" value="/usr/share/nginx/html/index.html"/>
+    </components>
+  </application>
+  <infrastructure name="infra">
+    <generators xsi:type="infra:VMImage" name="vm_img" uri="ami-xxxxxxxxxxxxxxxxx" kind="IMAGE" generatedVMs="//@infrastructure/@groups.0/@machineDefinition"/>
+    <credentials xsi:type="commons:KeyPair" name="ssh_key" user="ec2-user" keyfile="/tmp/ssh_key_file" algorithm="RSA" bits="4096"/>
+    <groups xsi:type="infra:AutoScalingGroup" name="ag">
+      <machineDefinition name="vm1" credentials="//@infrastructure/@credentials.0" generatedFrom="//@infrastructure/@generators.0">
+        <ifaces name="i1" endPoint="10.0.0.1" associated="//@infrastructure/@securityGroups.0"/>
+        <location region="eu-central-1"/>
+      </machineDefinition>
+    </groups>
+    <securityGroups name="sg" ifaces="//@infrastructure/@groups.0/@machineDefinition/@ifaces.0">
+      <rules name="icmp" protocol="icmp" fromPort="-1" toPort="-1">
+        <cidr>0.0.0.0/0</cidr>
+      </rules>
+      <rules name="http" kind="INGRESS" protocol="tcp" fromPort="80" toPort="80">
+        <cidr>0.0.0.0/0</cidr>
+      </rules>
+      <rules name="https" kind="INGRESS" protocol="tcp" fromPort="443" toPort="443">
+        <cidr>0.0.0.0/0</cidr>
+      </rules>
+      <rules name="ssh" kind="INGRESS" protocol="tcp" fromPort="22" toPort="22">
+        <cidr>0.0.0.0/0</cidr>
+      </rules>
+    </securityGroups>
+    <networks name="vpc" protocol="tcp/ip" addressRange="/24">
+      <subnets name="vpc_subnet" protocol="tcp/ip" addressRange="/24"/>
+    </networks>
+  </infrastructure>
+  <concretizations name="con_infra">
+    <providers name="aws">
+      <vms name="ec2_vm" maps="//@infrastructure/@groups.0/@machineDefinition">
+        <annotations xsi:type="commons:SProperty" key="vm_name" value="nginx-host"/>
+        <annotations xsi:type="commons:SProperty" key="instance_type" value="t2.micro"/>
+        <annotations xsi:type="commons:SProperty" key="ssh_key_name" value="demo-key"/>
+        <annotations xsi:type="commons:SProperty" key="ec2_role_name" value="demo-ec2-role"/>
+      </vms>
+      <vmImages name="concrete_vm_image" maps="//@infrastructure/@generators.0"/>
+      <networks name="concrete_net" maps="//@infrastructure/@networks.0">
+        <annotations xsi:type="commons:SProperty" key="vm_name" value="nginx-host"/>
+      </networks>
+    </providers>
+  </concretizations>
+  <optimization name="opt">
+    <objectives xsi:type="optimization:MeasurableObjective" kind="min" property="cost"/>
+    <objectives xsi:type="optimization:MeasurableObjective" kind="max" property="availability"/>
+    <nonfunctionalRequirements xsi:type="commons:RangedRequirement" name="req1" description="Cost &lt;= 70.0" property="cost" max="70.0"/>
+    <nonfunctionalRequirements xsi:type="commons:RangedRequirement" name="req2" description="Availability >= 66.5%" property="availability" min="66.5"/>
+  </optimization>
+  <configurations name="conf">
+    <deployments component="//@application/@components.0" node="//@infrastructure/@groups.0/@machineDefinition"/>
+  </configurations>
+  <functionalRequirements name="req_ext" description="```&#xA;&#xA;# + &quot;VM must have iface and iface is connected to network&quot;&#xA;# &#x9;forall vm (&#xA;# &#x9;&#x9;vm is class abstract.VirtualMachine&#xA;#    &#x9;implies&#xA;#        (&#xA;#        &#x9;vm has abstract.ComputingNode.ifaces iface&#xA;#        &#x9;and&#xA;#        &#x9;iface has abstract.NetworkInterface.belongsTo net&#xA;#        )&#xA;#    )&#xA;# error: &quot;TEST ERROR&quot;&#xA;&#xA;- &quot;VM must have iface and iface is connected to network&quot;&#xA;&#x9;vm is class abstract.VirtualMachine&#xA;&#x9;and&#xA;&#x9;not exists iface, net (&#xA;    &#x9;vm has abstract.ComputingNode.ifaces iface&#xA;    &#x9;and&#xA;    &#x9;iface has abstract.NetworkInterface.belongsTo net&#xA;    &#xA;    )&#xA; error: &quot;TEST ERROR&quot;&#xA; &#xA; ```"/>
+</commons:DOMLModel>
diff --git a/tests/doml/v2.2/nginx_func_req_neg.domlx b/tests/doml/v2.2/nginx_func_req_neg.domlx
new file mode 100644
index 0000000000000000000000000000000000000000..206a82af3d96c2f2a393981599b26adf6cfd5b94
--- /dev/null
+++ b/tests/doml/v2.2/nginx_func_req_neg.domlx
@@ -0,0 +1,59 @@
+<?xml version="1.0" encoding="ASCII"?>
+<commons:DOMLModel xmi:version="2.0" xmlns:xmi="http://www.omg.org/XMI" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:app="http://www.piacere-project.eu/doml/application" xmlns:commons="http://www.piacere-project.eu/doml/commons" xmlns:infra="http://www.piacere-project.eu/doml/infrastructure" xmlns:optimization="http://www.piacere-project.eu/doml/optimization" name="nginx_func_req" activeConfiguration="//@configurations.0" activeInfrastructure="//@concretizations.0">
+  <application name="app">
+    <components xsi:type="app:SoftwareComponent" name="nginx">
+      <annotations xsi:type="commons:SProperty" key="source_code" value="/usr/share/nginx/html/index.html"/>
+    </components>
+  </application>
+  <infrastructure name="infra">
+    <generators xsi:type="infra:VMImage" name="vm_img" uri="ami-xxxxxxxxxxxxxxxxx" kind="IMAGE" generatedVMs="//@infrastructure/@groups.0/@machineDefinition"/>
+    <credentials xsi:type="commons:KeyPair" name="ssh_key" user="ec2-user" keyfile="/tmp/ssh_key_file" algorithm="RSA" bits="4096"/>
+    <groups xsi:type="infra:AutoScalingGroup" name="ag">
+      <machineDefinition name="vm1" credentials="//@infrastructure/@credentials.0" generatedFrom="//@infrastructure/@generators.0">
+        <ifaces name="i1" endPoint="10.0.0.1" belongsTo="//@infrastructure/@networks.0" associated="//@infrastructure/@securityGroups.0"/>
+        <location region="eu-central-1"/>
+      </machineDefinition>
+    </groups>
+    <securityGroups name="sg" ifaces="//@infrastructure/@groups.0/@machineDefinition/@ifaces.0">
+      <rules name="icmp" protocol="icmp" fromPort="-1" toPort="-1">
+        <cidr>0.0.0.0/0</cidr>
+      </rules>
+      <rules name="http" kind="INGRESS" protocol="tcp" fromPort="80" toPort="80">
+        <cidr>0.0.0.0/0</cidr>
+      </rules>
+      <rules name="https" kind="INGRESS" protocol="tcp" fromPort="443" toPort="443">
+        <cidr>0.0.0.0/0</cidr>
+      </rules>
+      <rules name="ssh" kind="INGRESS" protocol="tcp" fromPort="22" toPort="22">
+        <cidr>0.0.0.0/0</cidr>
+      </rules>
+    </securityGroups>
+    <networks name="vpc" protocol="tcp/ip" addressRange="/24" connectedIfaces="//@infrastructure/@groups.0/@machineDefinition/@ifaces.0">
+      <subnets name="vpc_subnet" protocol="tcp/ip" addressRange="/24"/>
+    </networks>
+  </infrastructure>
+  <concretizations name="con_infra">
+    <providers name="aws">
+      <vms name="ec2_vm" maps="//@infrastructure/@groups.0/@machineDefinition">
+        <annotations xsi:type="commons:SProperty" key="vm_name" value="nginx-host"/>
+        <annotations xsi:type="commons:SProperty" key="instance_type" value="t2.micro"/>
+        <annotations xsi:type="commons:SProperty" key="ssh_key_name" value="demo-key"/>
+        <annotations xsi:type="commons:SProperty" key="ec2_role_name" value="demo-ec2-role"/>
+      </vms>
+      <vmImages name="concrete_vm_image" maps="//@infrastructure/@generators.0"/>
+      <networks name="concrete_net" maps="//@infrastructure/@networks.0">
+        <annotations xsi:type="commons:SProperty" key="vm_name" value="nginx-host"/>
+      </networks>
+    </providers>
+  </concretizations>
+  <optimization name="opt">
+    <objectives xsi:type="optimization:MeasurableObjective" kind="min" property="cost"/>
+    <objectives xsi:type="optimization:MeasurableObjective" kind="max" property="availability"/>
+    <nonfunctionalRequirements xsi:type="commons:RangedRequirement" name="req1" description="Cost &lt;= 70.0" property="cost" max="70.0"/>
+    <nonfunctionalRequirements xsi:type="commons:RangedRequirement" name="req2" description="Availability >= 66.5%" property="availability" min="66.5"/>
+  </optimization>
+  <configurations name="conf">
+    <deployments component="//@application/@components.0" node="//@infrastructure/@groups.0/@machineDefinition"/>
+  </configurations>
+  <functionalRequirements name="req_ext" description="```&#xA;&#xA;# + &quot;VM must have iface and iface is connected to network&quot;&#xA;# &#x9;forall vm (&#xA;# &#x9;&#x9;vm is class abstract.VirtualMachine&#xA;#    &#x9;implies&#xA;#        (&#xA;#        &#x9;vm has abstract.ComputingNode.ifaces iface&#xA;#        &#x9;and&#xA;#        &#x9;iface has abstract.NetworkInterface.belongsTo net&#xA;#        )&#xA;#    )&#xA;# error: &quot;TEST ERROR&quot;&#xA;&#xA;- &quot;VM must have iface and iface is connected to network&quot;&#xA;&#x9;vm is class abstract.VirtualMachine&#xA;&#x9;and&#xA;&#x9;not exists iface, net (&#xA;    &#x9;vm has abstract.ComputingNode.ifaces iface&#xA;    &#x9;and&#xA;    &#x9;iface has abstract.NetworkInterface.belongsTo net&#xA;    &#xA;    )&#xA; error: &quot;TEST ERROR&quot;&#xA; &#xA; ```"/>
+</commons:DOMLModel>