HCJes

I am guessing there is no corruption issues since ABKO worked fine.

Try clearing the error flag in LD 43
Type EDD CLR
This will clear the last error flag.
See if EDD completes without errors.

Some user on Google stated that a SYS LOAD cleared the problem. I would try this if the error continues since ABKO completed OK.

You will need to contact Nortel certified vendor if the error continues.