Hi, David,
I know you've indicated they are only using Ledger, Receivables and Lanpak. However, when you look at their datapath, do you see any data files other than those beginning with AR and GL (as well as the ADSPROF.xxx file)?
I'm wondering if, at some point, they did have/create some other data that is now causing the 1212 error.
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Regards,
Softrak Tech Support