How to update customer on an active Sales Contract

Summary:

We have a scenario where an active sales contract needs to be updated to add a new customer party. In the Fusion application, when we tried amending the contract to add new customer party, it fails with error- You can have only 1 primary party. (OKC-195722). When we tried removing the existing customer, the same fails with error- You can't update the primary party of a contract. (OKC-196065). Is there any way to achieve this?

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