Updates lost in case of 2 managers

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Hi,

We have a project that tasks have different status manager, both them are
able to access this project file from Ms-Project Professional and authorized
for publication. We found following situation:
- Resource A updated Task A and submitted to PM_A with automatic approval;
- Resource B updated Task B and submitted to PM_B without automatic approval;
- PM_A updated project plan and published updates before PM_B approved
updates from Resource B;
- Resource B found all task updates he made are disappeared.

Question:
- How to solve this issue from above senario?

Thanks in advance,

JJin