Project Owing Organization is grayed out, how to enable them for editing

Summary:

I am trying to update the Project Owning Org, it was wrongly update with diff org. When i tried to change to change in Manage Financial Project setting in Manage Project Financial WB, it shows grayed out.

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

R13

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