SAP Knowledge Base Article - Public

2654901 - MRP Creates Purchase Proposals with Wrong lot-sizing Method

Symptom

Material Requirement Planning (MRP) creates purchase proposals with wrong lot-sizing method.

Environment

SAP Business Bydesign All Versions

Reproducing the Issue

  1. Go to Supply Planning Work Center.
  2. Go to Products View.
  3. Search Product ABC (ABC stands for production ID) with Production Specification DEF (DEF stands for production specification ID).
  4. Click Open.
  5. Click Run Planning - Multi BoM level.

You could see that there were multiple purchase proposals generated. However, in the material master data, the planning procedure is "demand - driven",  lot-sizing method is "periodic lot-size", and period type is "month". You expect that there should be only one proposal generated for demand within a month.

Cause

For Products with Production Specification, the lot sizing method "Lot-for-Lot" is automatically applied. The lot-sizing method maintained in the product data are ignored for supply planning of products with production specification.

Resolution

This is standard system behavior.

Keywords

MRP, lot-sizing method, Purchase Proposals, Production Specification. , KBA , AP-SDM , Supply and Demand Matching , How To

Product

SAP Business ByDesign all versions