Remittance Import Template - Can't Link PAYFRM and PAYMENTH Tables

SUGGESTED

We're working on a remittance import template for our client and are looking for a way to link the PAYFRM and PAYMENTH tables. Currently when adding FRMNUM to the link column, we encounter a warning stating that the link does not appear coherent. The export will only export the PAYFRM data with this configuration. How can we link these tables to finish creating an import template to create remittance records?