The sold to party field on the overview screen gets greyed out automatically once the delivery is created (once sales order gets a status of Complete). This change has connection with status profile, hence you will have to very careful before making any changes to this. The option would be try via Sales Document Save User Exit and test it for impacts.
Apologies for a late reply. Try using this exit: MV45AFZZ for sales document processing, USEREXIT_FIELD_MODIFICATION. Take an ABAP person help in writing down a code.
Just ensure that your action does not have any impact to the document status, particularly if you are using Credit checks. Try this option and please let me know if it works to your requirements.
If the delivery is reversed & deleted, then the sales order status changes from Completed to Being Processed, hence the sold to party will not be greyed out on the overview screen. The document flowchanges impacts this field in particular.
In t.code VOPA, go to the sales header partner procedure. Then against partner function sold-to party, check the box Not changeable and save. Try again by creating a new sales order and check the results.
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