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I figured it out. First of all, to populate the subfile, I wasn't using EXFMT, I was using WRITE to the subfile format -- not the subfile control format. I was doing this in a DOW loop, reading from a physical file, then WRITE ing to the subfile. Then, to display the subfile, I was using EXFMT on the subfile control record, which was working. If Enter was pressed, I was deleting the records in the corresponding physical file that matched the subfile record, then once again stepping through the physical file populating the subfile, then doing another EXFMT on the subfile control format. After doing a trace, I realized that it was this SECOND EXFMT (same statement, second time calling it) that was causing the error... The problem -- I wasn't taking any action to reposition the physical file before reading through it again to populate the subfile, so it had zero records in it (ROOKIE!!!). Thanks to all for your help, I appreciate it!
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