Plant non-modifiable in Sales Order

D/ Friends,

We create Sales Order with reference to Contract. We enter Plant and Batch in the Contract. Now our requirement is that we want that Plant and Batch fields should be non-modifiable in Sales Order. How can we achieve this through std. config? If it is not possible through std. config then how can we do it through development? I know how to achieve this requirement through following things:

1. MV45AFZZ - USEREXIT_SAVE_DOCUMENT

2. SHD0

But isnu2019t it possible through std. config.?

Thanks.