MSIR.0654 Macro variable (varname) not defined

A macro variable dummy string (something that begins with ?!) was encountered, but the macro variable after the ?! was not defined. The likely causes of this are:

• A ?! occurring by happenstance in a comment. Change the comment to say have a space between the question and exclamation mark.
• A misspelled macro variable name. Correct the macro variable name.
• A macro variable name that just isn't defined sometimes, for the code that contains the dummy string. Embed the problem clause in a macro !If block.