Definition

Time buffer for covering product requirements.

The safety time requires that a requirement should be covered not by the requirements date/time but by a correspondingly earlier date/time. Therefore, early receipts should be used or created accordingly during planning to cover a requirement.

Use

In Production Planning and Detailed Scheduling (PP/DS), only product heuristics use the safety time. A product heuristic takes the safety time into consideration by subtracting the safety time from each requirements date/time at the start of a planning process; in other words, it shifts each requirements date/time to a corresponding earlier date/time. The net requirements calculation takes place on the basis of the earlier requirements dates/times. When new receipt elements are created for an uncovered requirement, the early requirements date/time is regarded as the desired availability date/time.

The safety time is location product specific. You enter it in the location product master on the Lot size tab page under Determination of quantities and dates in the safety days’ supply field. The safety time entered is only working time. During planning, the system determines the working and non-working times from the location’s production calendar.