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[#1]

The following diagnostic is generating:

Interest Income Item # {PrefixNum} : Enter a valid social security number for all seller-financed mortgage interest income sources. The IRS does not allow EINs for seller-financed mortgage interest. The SSN must be in the valid range for SSNs. It must contain nine digits and cannot be all zeros or nines.

Solution:

The IRS e-file system does not allow an EIN to be entered as the payer of seller-financed mortgage. The return will have to be paper filed.

Help Article 

Critical, will prevent e-file transmission.

[sjrcpa]

So just report the interest income as if it was bank interest