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Modifies the subfile record so that it is read on a get-next-changed
This is used in conjunction with the "READC";
Typicaly the READC is used to read the changed subfile records. YOu use an indicatior on SFLNXTXCHG and turn it on if you want to read the record again in the next iteration of the routine that uses the READC.
I personaly think it is best to avoid the SFLNXTCHG and the READC. Straight forward is always best for the next poor sap who has to read your code.
Hunting down the future ms. Ex DeadManWalks. *certain restrictions apply