InterUnit Report Question

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 an InterUnit Charge for data coming into PeopleSoft from the external subsystem.  If you have been able to satisfy this requirement, it would be greatly appreciated if you could share the design logic.