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I think I figured it out. nIndex was defined as an integer array and not a single value integer. Once I changed that it works great! Fantastic macro by the way, thanks for sharing!

Hello Terry, To pickup where Mark left off. Yes, the nIndex does exist in the Variables tab as an integer variable, but the macro is still throwing the same error: Undefined variable or the variable is the wrong type "%nindex%" Macro Name: MedicalList-James Line Number: 4