collectors are assigning to Customer Accounts or Bill-To location without invoices

Hi,

as per Oracle User Guide, collector needs to be assigned to customer accounts or bill-to location, if invoices are existing.

update from Oracle Advance collections user guide, "Assignment can be done at the customer (party) level, at the account level or at the bill-to level, but Oracle Territory Manager only assign collectors to customers with delinquencies. Customers with delinquencies have balances in the AR_TRX_BAL_SUMMARY table."

https://docs.oracle.com/cd/E18727_01/doc.121/e13452/T387641T387644.htm#iexiascl

but in our case, collectors are assigning to customer accounts or bill-to location without invoices. Please let me know which one is correct.