Thanks to everyone who responded and although he tried out all the options provided, nothing actually worked however it looks like it is working now. The first step was to implement the original it was based upon from the Redbook and that worked fine out of the box. I then looked at what messages he was processing via MPF and saw a couple that looked familiar as being used by another subsystem which also 'traps' messages. Once I removed the startup of the STC and all references to it in PARMLIB (IEFSSN in particular), no more abends occurred. So it basically wasn't the fault of the code (apparently he has coded MPF exits before, just wanted to try a different method and to use System REXX) but the interaction with other subsystems. Personally I could have done this with System Automation in a couple of minutes but this is a good learning curve for both of us in particular during the investigation. Once again, many thanks to everyone who took the time and effort to reply, it was much appreciated and did help in furthering our education (particularly me.)
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