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I found this in the V5R2 Memo to Users draft, http://publib.boulder.ibm.com/pubs/html/as400/v5r2/ic2924/info/rzaq9.pdf Changes for lock materialization MI instructions In V5R2, lock materialization MI instructions MATAOL, MATOBJLK, and MATDRECL can return a transaction control structure system pointer at the same offset that a process control space system pointer is returned in prior releases. If the returned system pointer is used in a MI instruction that only accepts a process control space system pointer, that instruction will fail if a transaction control structure system pointer is used. A system pointer to a transaction control structure will be returned if materializing lock information on a transaction object. You can determine if the returned lock information is for a transaction object by checking the value of the Lock scope object type field in the returned data.
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