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Shubham Joge 9Shubham Joge 9 

once the orderd products are added on order ,no one should be allowed to change the price book on order

once the orderd products are added on order ,no one should be allowed to change the price book on order
{tushar-sharma}{tushar-sharma}
You  can create a rollup field on order which will count Order product. Create validation rule if Order Product count > and ISCHANGED (Pricebook) then throw error.

If this answer helps you, please mark it as accepted.

Regards,
Tushar Sharma
https://newstechnologystuff.com/