diff --git a/mocha-common/data/libraries/yaml/net.alcetech.Mocha.System/003-Classes/00148-RelationalOperator.yaml b/mocha-common/data/libraries/yaml/net.alcetech.Mocha.System/003-Classes/00148-RelationalOperator.yaml
index 091d10d..a5485e4 100644
--- a/mocha-common/data/libraries/yaml/net.alcetech.Mocha.System/003-Classes/00148-RelationalOperator.yaml
+++ b/mocha-common/data/libraries/yaml/net.alcetech.Mocha.System/003-Classes/00148-RelationalOperator.yaml
@@ -1,5 +1,8 @@
 - entityDefinitions:
   - IDC_RelationalOperator: '{f1b5d26f-2347-49cb-8aae-d80dd706fce2}'
+    
+  - IDR_Relational_Operator__has_reciprocal__Relational_Operator: '{706f4bdd-5196-40ca-924d-7ddd5d01d3b3}'
+  - IDR_Relational_Operator__reciprocal_for__Relational_Operator: '{bea41570-79b0-4637-8827-ec742bd2d3c8}'
   
   - IDI_RelationalOperator_Subset: '{76d42d7c-f7da-4df6-92cc-b362e3a87d7b}'
   - IDI_RelationalOperator_Empty: '{b416747b-537f-46f9-b855-e71ca361d265}'
@@ -31,6 +34,25 @@
     attributes:
     - instance: '&IDA_Name;'
       customTagName: 'name'
+    relationships:
+    - instance: '&IDR_Relational_Operator__has_reciprocal__Relational_Operator;'
+      customTagName: 'reciprocalOperator'
+  
+  - relationship: '&IDR_Relational_Operator__has_reciprocal__Relational_Operator;'
+    index: 4263
+    sourceClassId: '&IDC_RelationalOperator;'
+    type: 'has reciprocal'
+    destinationClassId: '&IDC_RelationalOperator;'
+    siblingRelationshipId: '&IDR_Relational_Operator__reciprocal_for__Relational_Operator;'
+    singular: yes
+
+  - relationship: '&IDR_Relational_Operator__reciprocal_for__Relational_Operator;'
+    index: 4264
+    sourceClassId: '&IDC_RelationalOperator;'
+    type: 'reciprocal for'
+    destinationClassId: '&IDC_RelationalOperator;'
+    siblingRelationshipId: '&IDR_Relational_Operator__has_reciprocal__Relational_Operator;'
+    singular: no
 
   - relationalOperator: '&IDI_RelationalOperator_Subset;'
     index: 7