Hi Saurav,
Well, you will have to achieve this through Development, there is no chance to achieve this to standard SAP functionality. Even I strongly recommend you to not to go for this critical development, it will surely affect system performance.
Why don't you go for a Custom Pending Sales Order Report where you can write a logic and system will update the accordingly. Believe me, users always like reports rather than opening each transaction one by one.
Please let us know if any help required.
Adding to this why you are creating Return Order against Qty Contract. Share me the details on it.
Regards
Abhishek
Message was edited by: Abhishek Laghate