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Given that the program that's crashing doesn't actually use the MULTDS it is passed, but merely passes it, if available, to a customized UNDEL2, and given that everything in an OPM program call is passed by reference, I tried this:

I changed the optional parameter to a simple 1-character field.

Now, if the MULTDS is received (in the 1-character field), it is passed on to the custom UNDEL2. If it isn't, it isn't. And it looks like the custom UNDEL2 is getting the whole MULTDS.

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*BUT I'M WORRIED.* This MULTDS can potentially have 9999 occurrences of 186 bytes each. Could there be side effects of passing a reference as if it were only one byte?


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