WMS-to-SAP integration cost
Three options: SAP EWM (no integration), best-of-breed bolt-on via SAP-certified middleware (PI/PO or BTP Integration Suite), or RISE bundling. Each has a different cost shape on a 5-year horizon.
Master data and transactions
Material master, vendor master, customer master, inbound delivery, outbound delivery, goods receipt, goods issue, invoice. Each touchpoint requires mapping plus error-handling. Typical best-of-breed on S/4 runs 800-2,400 SI hours at $250-$350/hr.[s-04]
PI/PO or BTP Integration Suite
SAP-certified middleware is the standard. PI/PO is on-prem and being phased toward BTP Integration Suite. BTP runs a subscription with packaged adapters and pre-built EWM-WMS templates from the WMS vendor.
When RISE is the answer
If you are migrating from ECC and have not yet picked a WMS vendor, RISE with SAP + embedded EWM is the single-vendor path. No integration line item, no certified-middleware overhead. The trade-off is reduced WMS functional depth.
Buyer questions
Manhattan or Blue Yonder on S/4HANA - integration cost?
Plan for 6-12 months of SI consulting and a $500K-$1.5M integration line item on a tier-1 deployment. That is in addition to the WMS implementation itself.
Can I avoid SAP-certified middleware?
Yes but you carry the certification burden and SAP support will push back on issue resolution. For tier-1 deployments, certified is the realistic path.