Hi Derek,
It is strange thing happening.If the entries in table PTREQ_ATTABSDATA is getting multiplied there can be many reasons. Might be some report or wrokflow task executing in loop in the system.
Please check the history of the workflows triggered in the system and confirm no new workflows are not triggered. If some workflow is still running complete it.
Also check the details of PTREQ_ATTABSDATA entries so to identify for which PERNR and date new entries are getting created.
Regards,
Jayaraj