In automatic planning, the system performs the procurement quantity calculation based on the uncovered requirements it determined beforehand using a net requirements calculation , for example.
Procedures for calculating the procurement quantities are specific to a heuristic. The standard heuristic for
planning standard lots
SAP_PP_002 uses the assembly scrap, a standard lot-sizing procedure, and depending on the standard lot-sizing procedure minimum lot size, maximum lot size, and rounding settings, to calculate procurement quantities. The standard heuristic SAP_PP_003
planning shortage quantities
always plans using the lot-for-lot order quantity. The heuristic takes account of the assembly scrap, the minimum lot size, the maximum lot size, and rounding.
During the calculation of the procurement quantity the system considers the assembly scrap and the standard lot-sizing procedure from the location product master. Only lot-for-lot order quantities and fixed lot sizes are permitted here. For lot-for-lot order quantities the system considers minimum lot size, maximum lot size, and rounding settings.