If you see this critical diagnostic, you must have already entered 1 on Screen 45.1 for 1=social security coverage in country other than U.S.

You should check that Sch 2, Line 4 also shows "EXEMPT, SEE ATT".

When you attach the Certificate of Coverage from the country in which your client is working, you can't point it to Sch 2 (or Sch SE, which doesn't need to be filed).  Instead, enter the following:

• Description of file: Coverage of Coverage, <Country Name>
• Link to form (defaults to main form): Select Form 1040 - Other

Click on View PDF to make sure the correct file is attached.

Go back to Diagnostic and ignore the diagnostic for needing to attach the statement.