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That link is dead as it points to the old Primavera KB (pre Oracle takeover).
The updated Oracle KB article and link is:
Error: SEVERE: Cannot edit Projwbs, the project is either locked exclusively or checked out by another user." when selecting Update Existing Project through XML [ID 910383.1]
However, I do not think you can access this without a current maintenance agreement. My suggestion would be to renew your maintenance or contact Oracle Support directly.