ERP owns orders, finance and item masters. WMS owns the bin, the picker and the barcode. They integrate. They do not replace each other.
ERP is good at "how many should we have bought" and "what did we invoice". WMS is good at "which pallet, which lot, which person". When one product tries to be both, either finance or the aisle loses.
Item codes, purchase and sales orders, and the financial posting. Replacing a working finance core to get better picking is usually the expensive way to fail.
Locations, putaway, picks, counts, holds and device jobs. Totals can roll up to ERP after the physical event is true.
Agree item codes, lot numbers and posting time with the ERP owner before anyone "guesses" fields into SAP or another suite. Failed posts need a retry rule, not a chat message.
If you only need a total and one location, maybe. If pickers hunt by memory, ERP inventory is still a ledger.
Yes, through the interfaces or staging tables your SAP team already allows for material documents. Field mapping is done with their consultant.
Walk a receive and a pick in the demo. If it cannot name your exceptions, you still need warehouse software — whatever the brochure says.
Keep finance in ERP. Put the aisle in WMS. We will list the documents that must cross at /en/contact/.