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This error generally means there is a communication issue between the database and the client.
-Check to ensure the correct firewall ports are open for your database instance.
-Is the client connecting over a wired or wireless network connection?
-Try pinging the database server continuously to see if there is a connection loss during the time the application error occurs.
For reference see:
Datatbase Connectivity issue - primavera P6 V7
"Database Server Error: Connection failure [ID 907550.1]" in the Oracle KB.