The SAP Bill of Materials (BOM) system is integral for managing the components required to manufacture a product. Look no further than this handy table relationship diagram! It lays out the core tables involved in SAP BOMs in a clear, visual way.
Key Tables in SAP BOM
- MAST – Links materials to BOMs.
- STKO (BOM Header): This table holds the head information for each BOM. Think of it as the overall details like BOM category, number, and status.
- STPO (BOM Item): This is where the items or components of your BOM are listed. Each item in your product recipe is recorded here.
- STPU (BOM Sub-item): Need even more detail? STPU is for sub-items within a BOM item. Think of nested components or further breakdowns.
- STAS (BOMs – Item Selection): This table is interesting! It manages alternative BOMs and links item nodes. Crucially, it connects BOM items to their alternative BOM options – a key detail often missed!
- STZU (Permanent BOM Data): This seems to hold some persistent BOM data – less detail is given on this one, but it’s part of the BOM structure.
Table Relationships
- MAST to STKO – Establishes the relationship between materials and their corresponding BOMs.
- STKO to STAS – Connects BOM headers to item selection details.
- STAS to STPO – Links item selections to specific BOM items.
- STPO to STPU – Relates BOM items to their sub-items.
Important Notes
- BOM item numbers (STLKN) are internally generated per BOM document.
- The data structure follows a four-layer hierarchy: BOM → Alternative BOM → Item → Sub-item.
- The relationship between items and alternative BOMs is stored in the STAS table, not in the STPO table.
Main Usage Areas
BOMs are utilized across various SAP modules, including:
- Document BOMs (DOST)
- Equipment BOMs (EQST)
- Sales Order BOMs (KDST)
- Material BOMs (MAST)
- Standard BOMs (STST)
- Functional Location BOMs (TPST)
- Project BOMs (PRST)
Understanding these tables and their relationships is crucial for effectively managing BOMs within the SAP ERP system.
