Hi,
on our case we had a relation defined in the parts, which Creo wanted to check-out.
It looked like this:
DESCRIPTION=PTC_COMMON_NAME
After these parts were renamed in Windchill PDMLink, as soon as the objects were loaded into a Creo session, Creo wanted to update the parameter DESCRIPTION because of this relation.
So the user was prompted to check-out.
BTW: Sorry for the late answer.
Regards
Johannes