<<What is the correct format of the call statement for a addin workbook
that contains a macro in module1...

Something like:
YourProject.YourModule.YourSub

or

[MyProject.xls].[MyModule].Main

See the topics "Avoiding Naming Conflicts" and "Calling Procedures with the
Same Name" in Visual Basic Conceptual Topics.
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Regards,
Bill Renaud