Change Primary Assignment Flag from one assignment to another via Redwood

Summary:

We have a requirement where the primary assignment needs to be terminated whereas the secondary assignment needs to be active. The primary assignment flag needs to be switched from one assignment to another. We are going through the below navigation:

Employment Info>Search for the secondary assignment>Click on the historical rows>Correct the top of the stack row. But the primary assignment flag is non-editable. Please advise how can we update the flag on the secondary assignment.

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