AR On Account Receipt GL postings - can I set a segment value based on the customer the receipt is o

I have been challenged to make AR GL postings arising from On account receipts include a segment value (in our COA called a counter party) drawn from the customer record. This works fine when the receipt is matched to a transaction, autoaccounting does it's job and draws the different components of the account string from either transaction type, standard line, Site, salesrep (etc etc based on autoaccounting type) so our movement to the trade debtors account includes the counter party for the customer to whom the transaction was generated against. There does not seem to be a way to do