A WMS runs locations, barcodes, PDA jobs and counts. ERP can own the order total. If you only store on-hand quantity, pickers still walk by memory.
Not "how many do we have on the book" but "where is this unit, who goes, and under which rule does it leave". Purchase orders can be born in ERP. Which pallet, whether you may split it, and which expiry leaves first are warehouse software.
A total-on-hand screen is a ledger. A WMS adds bins, job tasks and a scan loop. Calling the ledger a WMS does not teach a new hire the aisle.
Finance and item masters usually stay in ERP. The systems exchange documents. They do not replace each other. The Yueyong case is this shape: PC plus PDA, inbound, locations, picking, counts.
If finding goods is slow, counts never match, or volume outgrew Excel, evaluate one. A one-person room can start with a lighter stock tool and grow.
If you do not need locations or device jobs, maybe. If pickers hunt by memory, you do not have warehouse management yet.
No. Crews and kit in the field are operations software. Bins and picks are WMS. Do not buy one name for both.
Walk one real receive and one real pick. If locations are missing, you are shopping for WMS at /en/wms/.