Hello
It is the normal behaviour.
CAD and Part have their own revision. And CAd has not necessary the same revsion than WTpart
As the WTpart is the main object in Windchill , this behaviour "protects" a Released part ...
It allows the scenario to let CAD designers revise and work, and then BOM managers/Configuration managers connect the correct revision of CAD
or collect both CAD and WTpart to directly have the links between the revisions ...
We achieve this by customization, based on Lifecycle states and Revision schema ... During Prototype phases, CAD link is copied forward automatically on revise. Not after release to manufacturing.
If I remember, PTC R&D has this kind of enhancement in work ...