Capacity Resource Planning start dates

We have been using CRP since 2003 using 11i of the Oracle apps. The CRP forms would show the resources requirements, and the relevant capacity, for past due scheduled WIP jobs on the scheduled date. For example, a WIP job that was overdue would have resources scheduled on past dates. CRP would show the requirement for these resources on those past dates. The CRP reports would summarize the requirements into the current week, but the details of the requirements would remain in the database.  Since we implemented R12, CRP summarizes all past resource requirements, and relevant capacity, under the current date in the database.