This can happen when there are multiple records that start with the same key values. I would look to see if you have multiple instances of the same check number, same bank code during the period you are working on.

Thank you, turned out to be a blank record in the GL_Bank table.

We've seen that cause problems with BR too (most especially with rebuild sort files for BR). 

Sage really needs to add a check for blank rows in that table, to prevent errors / data corruption.  It would be nice if the blank rows could be prevented (AFAIK the cause is unknown), but when it happens, the program should still work properly.

Thanks!

Thanks!