The SQLCODE -551 error is telling you that DB2 does not have the correct GRANT's to execute the plan for authid USERID.
In the CA Database Management for DB2 for z/os main menu you have this menu item.
_A Product Authorization
Look for example for Report Facility Menu after you select it and use the "E" line command.
E__ Report Facility Menu
afterwards the screen expand as follows:
___ Report Facility Menu
D__ PRF Product Plan
D__ QMF to PRF Conversio
Use "D" on the two above to see the grant.
GRANT EXECUTE ON PLAN PRFRRxxx
GRANT EXECUTE ON PLAN PRFQRxxx
where xxx represent the used product release.
Grant execute for the authid USER1 to the two PRF plans you have in your hlq.CDBAPARM(PLANS00)
PRFPLN01=PRFRRxxx PRF Product Plan
PRFPLN02=PRFQRxxx QMF to PRF Conversion Plan
GRANT EXECUTE ON PLAN yourRRxxx plan TO USER1 GRANT EXECUTE ON PLAN yourQR171plan TO USER1
Package PRFWSTR is part of collection PRFRRxxx_COM bound into PLAN PRFRRxxx.