The assembler calls the exit with a request type of 4 (WRITE) when the exit is writing the associated data records. The buffer pointer field points to the associated data record, and the buffer length contains the length of the record. The record length for variable-length records does not include the 4-byte length of the record descriptor word (RDW), and the buffer pointer field points at the associated data header, not the RDW.
The user exit should maintain the absolute record number and the relative record number. These fields are set to zero before the OPEN request.
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