Fixes issue [420913] Support opposite EReferences for ModelObject operations
Fixes issue [420913] Support opposite EReferences for ModelObject operations
Added checking of target object class for ModelObject
Related to issue [420913], updated test models
Related to issue [420913], updated test models
Adapted [415716] testcase to use its own model
Added testcase for [420913]
Added testcase for [420913]
Changes to occasional test/demo project