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Routing-based CRP then calculates resource requirement dates by applying the resource offset to order due dates using the following formula:

Order date represents the planned order due date for planned orders and the completion date for discrete and non-standard jobs. Routing-based CRP treats suggested repetitive schedules as if they were planned orders for each workday between the schedule start date and the schedule end date, so for repetitive schedules, order date represents any date for which the schedule is active.

In RCCP, setback days for bills of resources is derived from processing lead times that are calculated by the lead time rollup process using the lead time lot size for the item. This is necessary since RCCP cannot anticipate what actual demand quantities will be placed via a master schedule. Since CRP uses actual planned order, repetitive schedule, and work in process job quantities, it can use the more accurate lead times calculated by the planning process using the following formula:

As a result of these more accurate lead times, CRP calculates resource requirement dates that are more realistic than those calculated by RCCP.