UGS::OCC_shadow_entity_occ error.. What does this means?

[NXsupport]

Hi ,

NX8.5.. What does UGS::OCC_shadow_entity_occ error mean? This is stopping from saving the file.. Log file says, real_tag ILLEGAL TAG XXXX.

Any Idea how can this be cured..

Ran Part cleanup more than 10 times, done structure update ,more than 5 times, did Feature >> Playback ..

This is assembly. No features on Assembly level..

Saw a PR on GTAC site for this issue..