How to update Primary party using contract loads?

Summary:

When I try to update the primary party on a active contract using contract load process I get an error that states "You can only enter a contract with 1 primary party. (OKC-196111)"

Content (required):

Is it possible to update an active contract's Primary Party using a Contract load?

Version (include the version you are using, if applicable):

22B

Code Snippet (add any code snippets that support your topic, if applicable):