ARC1900 NO LOCK FOUND: LOCK ON %s RELEASED IN THE MIDDLE OF THE ARCMAIN JOB
The ARC LOCK on the referenced database (or table) was released in the middle of the ARC job. Hence, the contents of the database/table may have changed during the ARC job.
Ensure that no other jobs release locks while an ARC job is running. This can lead to a corrupted archive (for an ARCHIVE operation), or to corrupted data (for a RESTORE, COPY, BUILD, or ROLLBACK/ROLLFORWARD operation).