how to derive AP Liablity (1st Segment) Using SLA Based on Payment Type or DFF selected in Expenses

Summary:

My Business having 3 business units (EH, CCI and ACPNY) for then we have implemented expenses, Now they bought another Business called ACPSS.

For ACPSS instead of they creating new BU in HCM they just added them under ACPNY BU and differentiated them with the help of Reporting establishment.

So for ERP, SCM we have created a BSV value 46000, and created an supplier site with liability account with 46000 so when ever an Vendor invoice is created with this site liability account come from there and for payment we created a Bank with GL cash a/c with 46000 BSV.

now we have a problem with the Employee expense where we want to customize the liability account for employee expense invoices, Payment request/or DFF based on Payment method selected by employee while entering Expense report.