I have versions 9.3A for both GL and AP but I think Andrew's comment is the answer as could not remember how I installed this initially all those years ago. The APALBTCH.xxx file is in the AP Data folder and there is also a APBRSCAL.xxx file which does not show as updated. I will move data over to the GL data folder and return to the forum if problem persists.

Thank you for your timely responses.

Regards,

Allan