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You can exchange partner of sales documents via the report of the mass document change.

Here you can not proceed as you wish, but you are restricted to certain partner functions.
For example you cannot change the ordering party of a document.
When exchanging partners in a document, the new partner must be entered in the customer master of the ordering party with the same partner function as the original partner. Otherwise the System does not carry out changes.
When using the mass document change you can only affect partners that are already existing in the document. In this manner you cannot enter additional partners in a sales document.

Thus you can exchange the goods recipient, the responsible employee, sales employee, or the forwarding agent with other partners in your sales documents.
Prerequisite
You must enter the partner function in the selection screen for which you want to change partners.
When entering the change parameter you must repeat your entry. You enter a customer you want to replace as change parameter. Then you enter another customer who the System should enter in the documents instead of the other one.