Teamcenter version 12.x,13.x,14.x
NX version 1980 and higher
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User is not able to delete a PDF dataset which is exported from NX drawing.
It says it is referenced to the UGMASTER by relation: NX Drawing
The said behavior is enhanced with NX1980, see the below statement in the NX documentation:
By default, the Relation customer default is set to the new No Relation option, so exported PDF or CGM datasets are attached to the NX drawing under the source part. When you select the Specification or Manifestation option, the PDF or CGM datasets are exported as a specification or manifestation under the item revision, with a relation to the NX drawing.
To delete the PDF dataset the user should cut the PDF dataset from the source dataset and then delete the PDF. The deletion of the PDF while under the Item Revision is successful once the PDF has been cut from the source dataset.