Supplier Import for Changes & Error Messages

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Hello: We are updating supplier fields for 1099 reporting via the supplier & supplier site templates. I wondered if anyone could give some guidance of a couple errors we are receiving on the suppliersite load.

1: You must provide a combination of values that represent a valid or unique site for the supplier record: This supplier has two sites, primary & secondary with different address (both pay sites); the overview tab contains Federal Reportable "yes", but both the sites has the "Tax Reporting site" flag as "no", we entered an update "Y" for the Supplier's Primary site in Tax Reporting site flag and it's generating the above error above. What is the issue here?