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Don't mean to send anybody on nostalgia trip but we have just encountered MCH4421 "Invalid Operation for program" on a line that does a FREE 'program_name' (FREE is the op code) I've never used this op code but I remember reading about back in the days of Merlin. However I don't seem to be able to look it up any more. It's just not in the manuals? Any clues? TIA, Captain J
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