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Source Item

Source item is used to identify the component that generates an individual resource requirement. Source item facilitates resource requirement traceability when single level resource requirements are rolled up to become cumulative resource requirements for a parent item. For single level resource requirements, the bill of resources item and source item are the same. For cumulative resource requirements, they are not.

In the Setback Days table, notice how single level resource requirements for components B and C are rolled up to become cumulative resource requirements for A. Note how the setback days and total hours change for the cumulative requirements.

For example, 4 days are required to build A, based on item lead times of 2 days each for A, B, and C. D1, R2 is needed at the start of operation 20 on day 2. Setback days for D1, R2 becomes 3 days when the resource requirement for D1, R2 is offset from the completion date of A rather than the completion date of C.

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