PLM and ERP overlap around products, suppliers and cost. The boundary becomes clear when you ask which decision each system is meant to support.
PLM manages the product while it is being decided. ERP manages commercial and operational transactions once the business is ready to buy, hold, sell and account for it. Real implementations still need an agreed line between them.
Let PLM own development context
Briefs, colorways, materials, measurements, samples, revisions, development costs and supplier questions belong close to the product decisions that create them.
Let ERP own transactions and financial control
Approved items, purchase orders, receipts, inventory, invoices and accounting usually belong in ERP. The system should not need every design discussion to process a transaction.
Agree the master for shared records
Style codes, supplier records, component codes and approved costs may exist in both systems. Name where each is created, which fields can change and how updates flow.
Set a clear approval handoff
Define the product state that permits ERP creation or purchase. If the gate is vague, teams will raise orders from incomplete specifications or keep retyping approved data.
Design error handling
Every integration eventually meets missing, duplicate or rejected data. Decide who receives the error, where it is corrected and how the successful update is confirmed.
Keep the user workflow simple
A product developer should not maintain finance fields, and a finance user should not resolve sample comments. Integration should move approved information without moving responsibility to the wrong team.
The goal is not to make both systems identical. It is to let each system control the work it understands while approved data moves across a visible boundary.