PeopleSoft Interunit reporting

Have you been able to identify the specific “detail line items” which generated an “InterUnit Charge” to a Business Unit & Affiliate relationship for data coming into PeopleSoft General Ledger from external systems, i.e., Payroll, where the Bank Account for one Business Unit may be used to fund and cross-charge multiple other Business Units within the same payroll transaction and therefore generate InterUnit Charges to multiple Business Units within the same journal entry (defined through a “Business Unit & Affiliate” relationship)?  We are having difficulty tying back to the “other side” of identifying the specific “detail line items” that generated