We just implemented PDM, and on our parts, we have a transition of "NON-ECO CHANGE" which will let us add configurations
to a part, with out changing the revision. When one of our designers does this, the part shows correctly on our data card & in PDM.
The issue is, when our shop floor views the part in PDM, they don't see the newly added configurations. For each configuration I even
saved and rebuilt each one.
I am not sure what version of PDM you are using but the way that we are setup we have to get the latest version of each part if we have opened it since the last time we purged the local cache. This could be your problem.