tkobayas commented on issue #6790:
URL: 
https://github.com/apache/incubator-kie-drools/issues/6790#issuecomment-4850733645

   ```
   package org.test;
   
   import org.drools.model.codegen.execmodel.domain.PositionalParent;
   import org.drools.model.codegen.execmodel.domain.Result;
   
   declare Child extends PositionalParent
       dept : String
   end
   
   rule Init when
   then
       insert( new Child("Mario", 40, "Sales") );
   end
   
   rule Check when
       $c : Child( name == "Mario", age == 40, dept == "Sales" )
   then
       insert( new Result($c.getName()) );
   end
   ```
   
   it works without `declare PositionalParent end`, but it has a subtle 
caveat... if `PositionalParent`'s package 
(`org.drools.model.codegen.execmodel.domain`) has a DRL, 
`ClassHierarchyManager.mergeFields` fails to find `PositionalParent`, so a 
different constructor is generated `Child(String dept)`. -> build error


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