SAP Message 3R813 - It is not possible to delete old T512E records (client &, PCG &)

Diagnosis
An error has occurred when deleting the old (converted) T512E datarecords. The conversion of all data records in this client and countrygrouping has been withdrawn.

WHAT_TO_DO&
Remove the error cause of the write disturbance (database access) andstart the XPRA again.