Production planning and ERP — how PPS, MRP-II and APS fit together
Production planning is the operational heart of any manufacturer. In a DACH Mid-Market setting, the planning function rarely lives in a single product: a Production Planningssystem (PPS) sits alongside the ERP backbone, an Advanced Planning and Scheduling (APS) tool may overlay the master plan, and the shop floor is increasingly fed by an MES (Manufacturing Execution System). The terminology is not standardised and vendors blur the boundaries on purpose. This page disentangles the planning layers, explains how PPS, MRP-II and APS work together with the ERP, and outlines what a DACH mid-market manufacturer should look for when the production-planning piece of the ERP project goes live.
PPS, MRP-II and APS — what is what?
Production Planningssystem (PPS) is the historical German term for the production-planning function inside or adjacent to an ERP. Material Requirements Planning II (MRP-II) is the underlying methodology: explode the bill of materials, generate dependent demand for components, plan capacity at work-centre level, release production orders. Modern ERPs typically implement MRP-II natively in their production module — SAP S/4HANA, Microsoft Dynamics 365 F&O, abas ERP, proAlpha all do this. Advanced Planning and Scheduling (APS) sits on top: it optimises the sequence of production orders against finite-capacity constraints, in-process inventory, sequence-dependent set-up times and customer due dates. APS is typically a specialist add-on (e.g. Asprova, ORTEC, FORCAM, Siemens Opcenter APS) integrated with the ERP, rather than a native ERP module.
Where ERP production planning ends and APS begins
An ERP's native MRP-II plans against infinite or coarse-finite capacity: it schedules production orders into time buckets (day or shift) against work-centre capacity, but rarely handles realistic minute-level sequencing across multiple constraints. For high-volume repeat manufacturing with relatively stable routings, native ERP planning is adequate. For complex manufacturing with frequent set-up changes, multiple bottlenecks, sequence-dependent set-up times or shared resources across product families, an APS overlay produces materially better throughput. The decision point in a DACH Mid-Market mfg ERP project is rarely whether MRP-II is needed (always yes), but whether APS is needed in addition. The answer is usually yes for discrete manufacturing above ~80 staff, no for process manufacturing under that scale.
Integration with MES and shop floor
An MES (Manufacturing Execution System) sits between the ERP and the shop-floor machines. It captures real-time piece counts, machine status, quality data, operator activity and OEE (Overall Equipment Effectiveness). The integration with the ERP runs in both directions: ERP releases the production order with all its master data; MES feeds back actuals (completed quantities, scrap, downtime causes, operator time) for closing the order, costing, traceability and continuous-improvement. DACH mid-market MES products include FORCAM FORCE, MPDV HYDRA, GFOS, iTAC and Siemens Opcenter Execution. Microsoft Dynamics 365 F&O and SAP S/4HANA can also cover light-MES use cases natively for simpler operations.
What a production-capable mid-market ERP must do
- Multi-level BOMs with versioning, validity dates and ECN / ECO workflow
- Routing definition with work centres, set-up times and operation sequences
- MRP-II planning run with controllable horizon and lot-sizing rules
- Capacity planning with finite or infinite mode per work centre
- Production-order release, picking, confirmation and closing
- Backflushing and serial / lot tracking through production
- Variant configuration for make-to-order with parametric products
- Subcontract production with external-service procurement
- Costing roll-up with material, labour and overhead allocation
- Integration interface to APS and MES (REST / OData or OPC UA)
Vendor landscape in the DACH mid-market
The DACH manufacturing mid-market has a deep bench of production-capable ERPs. proAlpha and abas ERP are the long-established specialists, both with strong APS interfaces and broad reference customer bases in discrete manufacturing. oxaion and ams.erp target similar segments with different industry emphases (project manufacturing for ams.erp). Microsoft Dynamics 365 Business Central with manufacturing add-ons (e.g. Insight Works Shop Floor Insight, To-Increase) covers the lighter end. Microsoft Dynamics 365 F&O and SAP S/4HANA are the upper-mid-market options with the broadest functionality, paired with specialist APS (Asprova, FORCAM, Felios) and MES where needed. For process manufacturing, GUS-OS, CSB-System and SAP for Process Industries are the regular choices. Compare 7 PPS systems in detail.
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Frequently Asked Questions
Do I need APS on top of my ERP, or is the ERP's MRP-II enough?
The ERP's native MRP-II is enough if your production is high-volume, low-variety with stable routings and infinite-capacity assumptions match reality (a non-bottleneck operation). APS adds material value when you have sequence-dependent set-up times, several competing bottlenecks, mixed make-to-stock / make-to-order flow, or tight customer due-date commitments. Don't buy APS just because the brochure says you should — quantify the throughput uplift first.
How important is MES integration for a mid-market DACH manufacturer?
For mid-market manufacturers (above ~50 staff) running discrete or hybrid production, MES has become the standard, not the exception. Without MES, the ERP relies on manual confirmations from operators — which arrive late, miss data and distort costing. The integration runs over OPC UA or vendor-specific REST APIs and is usually scoped into the ERP project from the start in 2026.
Can I run production planning on Microsoft Dynamics 365 Business Central?
Yes, for SMB and lower-mid-market manufacturers with moderate complexity. Microsoft Dynamics 365 BC has native MRP-II, BOM, routing and capacity planning, and ISVs (Insight Works, To-Increase, Continia) add stronger shop-floor and manufacturing-execution capabilities. For complex multi-site discrete manufacturing or ETO (engineer-to-order), Microsoft Dynamics 365 F&O, abas, proAlpha or SAP S/4HANA tend to be the better fit.