Do you have to attach it as a pdf?

ProConnect doesn't include it in the efiled return?

If you do have to attach, make sure it is "linked" to Schedule E/S Corp basis or whatever the applicable choice the software gives you. The error is saying you haven't linked (referenced) it correctly or at all.

Thanks for your reply.

Yes, Proconnect is requiring the attachment of 7203 for a basis calculation as a shareholder for an S-Corp.  

If I reference another form other then 98 = Form 7203, it will throw a critical error: Form 7203, S Corporation Shareholder Stock and Debt Basis Limitations, must be attached as a PDF for electronic filing purposes.

Is this a glitch in the system, therefore making me have to mail in the return? 

Just to follow up on this issue.  It appears I was trying to submit an e-File amended return through the e-File return screen.  Support identified this issue.  Once I submitted the return through to proper screen, it was accepted.  Whoops.

FYI - You just joined a very large club! Thanks for sharing your OOPS!