Heat number traceability in SAP starts at goods receipt. When a steel bar, billet or plate is received, the mill test certificate reference (heat number) is captured as a batch characteristic along with the relevant mechanical and chemical properties — tensile strength, yield point, carbon content, any other spec values your quality plan requires. The heat number is stored against the batch in SAP, and that batch is consumed by production orders. When a production order picks steel from stock, the system records which batch (and therefore which heat number) was issued. If a production run uses multiple batches, all heat numbers are recorded against the production order. The finished goods batch is linked to all input batches — so the genealogy goes: finished goods batch → production order → steel batch → heat number. At dispatch, the delivery note or quality document can print the heat number of the steel used. If a customer later raises a quality concern about a specific heat, you can immediately identify every production order that used that heat, every finished goods batch produced and every customer delivery that contained components from that heat. This is the traceability that OEM customers and aerospace customers require, and it cannot be reconstructed after the fact — it has to be captured in real time at goods receipt and production confirmation.

Subcontracting in SAP is a specific procurement category — not just a purchase order. When a production order reaches the heat treatment or surface finishing operation, the system triggers a subcontract purchase order to the relevant vendor. The goods issue step records the semi-finished components leaving your facility (so your stock decreases by the components sent out). The subcontractor performs the treatment and returns the components with a process certificate. The goods receipt step records the return (stock increases by treated components) and triggers an inspection lot if your quality plan includes incoming inspection for the treatment. The subcontractor's invoice is matched to the purchase order. The cost of the subcontracting operation (heat treatment charge, plating cost) is allocated to the production order as an external processing cost — it appears in the actual cost of the finished component separate from your own machining cost. This complete loop — outbound goods issue, subcontractor PO, incoming GR with inspection, cost allocation — is what allows your finance team to see the true cost per component including all subcontracting steps, and what allows your quality team to maintain traceability through operations that leave your facility.

PPAP (Production Part Approval Process) requires a structured set of documentation for each customer part at each drawing revision: dimensional results report, material test certificate, control plan, process FMEA, initial sample inspection report and, for Level 3 PPAP, a full submission warrant. SAP Quality Management supports this through: inspection plans linked to customer part number and drawing revision (so the system automatically uses the current revision's inspection plan), usage decisions and quality notifications as the formal quality record, and document management for the PPAP documents themselves. When a drawing is updated, the engineering change management process in SAP updates the inspection plan effectivity date — production before the change date uses the old revision's inspection plan; production after uses the new one, and the audit trail records the change clearly. For IATF 16949 auditors, the inspection records in SAP demonstrate that your process follows the control plan, that non-conformances are recorded and dispositioned, and that corrective actions are tracked to completion. We configure the quality management setup for OEM suppliers as part of the implementation — the inspection plan structures, the usage decision workflows and the document management integration — so the system reflects your actual quality process rather than a generic template.

Standard cost in SAP for a metal component is built from: material cost (steel price per kg × consumption per piece), operation-by-operation activity rates (machine hour rate for Op10 turning, machine hour rate for Op20 milling, setup time rates separately), tooling consumption cost allocated per operation, and subcontracting cost for heat treatment and plating operations. This gives you a standard cost per piece before production begins. When a production order is executed, actual confirmations record: actual hours at each operation, actual scrap pieces at each operation, actual subcontracting charges from the vendor invoice. The variance between standard and actual is calculated at operation level — you can see that Op10 turning was ₹2.40 over standard per piece due to extra cycle time, and Op20 milling was ₹0.80 under standard because the operator achieved better feed rates than planned. Scrap at Op10 wasted ₹120 of material that did not make it to Op20. This operation-level cost visibility is what allows production management, finance and continuous improvement teams to focus on the right problems — not a total production order variance that could be caused by anything.

Yes — supplying multiple OEMs is a configuration challenge, not a capability limitation. Each OEM has their own part number for your component, their own drawing revision system, their own delivery scheduling format and their own quality requirements. SAP handles this through the customer material info record — mapping your internal part number to each customer's part number, so a sales order from OEM-A using their part number correctly references your production BOM and routing. Customer-specific inspection plans in SAP QM link your internal part to the customer's specific quality requirements — so a component supplied to Toyota might have different final inspection criteria than the same basic component supplied to Tata Motors, even if they use the same production BOM. Customer delivery schedules (JIT call-offs) can be received via EDI and planned against your production capacity. For automotive Tier-1 suppliers managing 50–200 OEM part numbers across 3–5 customers with different delivery rhythms, PPAP requirements and quality standards, SAP S/4HANA provides the data structures to manage all of this correctly — but it requires careful configuration at implementation to set up the customer-material relationships, customer-specific inspection plans and delivery schedule processing correctly. We configure this as standard for automotive supplier implementations.