How to handle Purchase Orders and Sales Orders with Old Material Numbers?

[ranjithjoy]

We are in the process of replacing around 9000 Materials with New Material Codes (This is done to activate Automatic Batch Split Valuation). Old Material Numbers will be maintained in MARA-BISMT. Stock will be moved to new material code. I have a few questions regarding this.

1. Should existing Purchase Orders and Sales Orders be closed before I do this activity? Or is there a way to use the new material codes to do goods receipt for existing POs and deliveries for existing SOs?

2. How do I handle sales return of older sales orders?

[PhanikumarV]

Hope you tried the option of Material substitution(VB11/12/13) for such scenarios?

[PhanikumarV]

also for partially open & return orders-how your client wants accordingly this can be designed(like a zero qty old material came in after 1month-what is expectation of client-hope you already explored MB1b with 309 movement type options(just sharing the thoughts)