COBOL invocation

     CALL 'MQBACK' USING HCONN, COMPCODE, REASON.

Declare the parameters as follows:

**   Connection handle
 01  HCONN     PIC S9(9) BINARY.
**   Completion code
 01  COMPCODE  PIC S9(9) BINARY.
**   Reason code qualifying COMPCODE
 01  REASON    PIC S9(9) BINARY.

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