Budget received from EPM should be non-editable in PPM

Please see the below business scenario and advise how we can handle this requirement -

Step1) Budget Version1 is created in PPM. This Budget will be submitted for approval.

Step2) Budget Version1 that is in 'Submitted' status in PPM will be sent over to EPM

Step3) EPM will receive Budget Version1 from PPM and will create Budget Version2.

Step4) Appropriation and Budget Approval will be done in EPM on Version and it will be sent back to PPM.

Step5) PPM should receive this Budget Version2 in 'Submitted' or 'Baselined' status so that it's not editable in PPM.

We are not able to receive Budget Version2 in PPM in 'Submitted' or 'Baselined' status as Budget Version1 is already in 'Submitted' status.