P6 Error "Field 'SERVERDATE' not found"

Dear Sir/Madam,

I'm doing the P6 operation test according to the scinario below.

When we tried the operation , then error happened.

Does anyone know the cause/solution about this issue??

I'd appreciate if someone provides helpful information.

[ Scinario ]

There are 2 user, A and B.

A and B opened the same P6 project.

A updated the P6 activity first, and B updated the same P6 activity in a few seconds.

Then, what happend??

[ Expected Result ]

The P6 activity updated by B. (The updated result by A is overwritten by B.)

[ Actual Result ]

Error message appeared.

    - Type : EDatabaseError

    - Event Code : F'SER-2240-D