When a promotion overlay situation exists, using ZMF4ECL 8.3.0 Build 674 displays the message ‘CMN3252A – xxxxxxxx.xxx exists in target promotion library, attempt to overlay’.  Clicking on ‘OK’, returns you to a prior screen and the promotion does not take place.  Checking the package in ZMF confirms the promotion did not take place.  Promoting the package in ZMF completes just fine.

Note: Same promotion scenario with ZMF4ECL 8.2 Patch 6 Build 609 does not display the error message and the promotion completes as expected. 

Full article: https://portal.microfocus.com/s/article/KM000015928