Does anyone know what this error means - I tried the online documentation
but was not enlightened.

*** ERROR 753 ILLEGAL KSAM OPERATION
ERROR DETECTED BY PROCEDURE CKDELETE
FILE NUMBER: 43
FILE NAME: CLMNTMF
I/O TYPE: 2
ACCESS TYPE: 2
PREVIOUS OPERATION: CKLOCK
**** Escape executed outside of TRY block; CODE = FFFD008F (UNWIND 9).

ABORT: WCS100W.JEPPGM.CLAIMS
NM SYS   a.00a994a0 dbg_abort_trace+$24
NM PROG  31c.00028908 wcs100$001$+$1870

Program was compatability-mode library routine - and did not experience
this error. It is now compiled into a stand-alone native mode program. No
change was made to any instructions in the source file.