Answer
Directly query what the Object Connection Transformation framework itself currently resolves for your specific objects: SELECT * FROM TABLE(Doc_Reference_Object_API.Get_Key_Refs('<TargetLuName>', '<KeyRefString>')), substituting your actual target LU name and key-reference string. This reveals exactly which source LUs and key references the framework currently associates with that target object, telling you whether your custom transformation rule is genuinely being recognized at all. If the query does return data confirming the rule is recognized, add debug/trace output statements directly inside your transformation method itself, with server output enabled, to confirm whether your custom code is actually executing when expected — this narrows down whether the problem is in rule recognition or in the transformation method's own logic.