How to block WBS or Network element field in Service Entry Sheet ML81n

Hi Guru
Would like to seek your advise on the following query.
We use Service master to trigger Purchase Order Service related (Item category = D; AAC = P).
Then, user will use T\code ML81n to create service entry sheet by reference to Purchase Order and service master document. During Service entry sheet creation, usually WBS element or Network element field will be populated automatically based on the information from Purchase Order.
However, user could overwrite the WBS element or Network element in service entry sheet. Thus, it creates discrepency WBS\Network element between PO and Entry Sheet.
1. Is there any way we could retrieve Service entry sheet not to allow user to update the WBS\network element field?
2. What will be the impact if we block the field from user.
Please advise

Hi Rag
Thanks for your reply.
When I trace the service master, there is no specify field to input WBS element.
Also, I have checked the service master entered by user, it seems that only the following fields are filled:-
Service Category
BuoM
Mat\Service Group
Valuation class
The rest of field are remained as blank as it might due to multiple WBS element shared 1 same service master
Please advise how I should block the WBS element from service entry to prevent overwriting.
Thanks

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