I am getting an error message saying that the client's federal return is not eligible for electronic filing because the "EITC is calculating from undocumented sources -- and that the rules are set by the IRS." Filing paper returns by mail, during these times, will mean lengthy time for the IRS to receive and process the return. Further, no information is provided by the software indicating which documents, if any, should be furnished when mailing federal return. Any thoughts? Thank you.