You have set the No change possible (C) field for the Sold-to party in the Set Up Partner Determination for Sales Document Header configuration, however you can still change the sold-to party field in the sales order overview.
SAP S/4HANA Cloud
Reproducing the Issue
1. Go to Manage Your Solution app
2. Go to configuration 101288 - Set Up Partner Determination for Sales Document Header
3. Field No change possible (C) is set for Sold-to Party function
4. Go to the Create Sales Orders - VA01 app, fill in the sales data so that the document is complete and Save
5. Go to Change Sales Order - VA02 app, enter the sales order number and press Enter
6. You are able to change the Sold-to party on the sales order overview screen
By design having the Not change possible flag attribute selected will not block the sold-to party field from being edited in the sales order overview.
The sold-to party field in the sales order overview becomes unchangeable when there are subsequent documents, for example, after creating a delivery document for a sales order, it is no longer possible to change the sold-to party.
The system is behaving as designed. Therefore, no solution is required.
Note: In case you want to block the sold-to-party field to be changed in the sales order without any subsequent documents. A Cloud BAdI Sales Document Check Before Save can be implemented to avoid change the sold-to party at the Change Sales Orders - VA02 app, see the sample below for your reference:
If salesdocument-salesdocument is not initial.
select single * from i_salesdocument with privileged access
where salesdocument = @salesdocument-salesdocument
into @data(ls_salesdoc_before_change) .
if salesdocument-soldtoparty ne ls_salesdoc_before_change-soldtoparty.
append value #( messagetype = 'E' messagetext = 'Change of Sold To Party is not allowed.' ) to messages.
By design having the Not change possible flag attribute selected will block the sold-to party field from being edited in the sales order header and item data at Partner tab
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