$UpdFile

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Use the $UPDFILE function in conjunction with the ON FIELD CONSTRAINT CONFLICT unit.

If $UPDFILE is invoked from an ON FCC unit following the detection of a field-level constraint conflict, it returns the name of the file in which the constraint violation occurs. If the file is remote, $UPDFILE also returns its location (in the form filename AT location). At all other times, $UPDFILE returns a null string. The $UPDFILE function takes no arguments.