CJ20N BADI for status w/o status numbers

Dear X'perts,

Appending is a scenario for new user statuses that I've just created for which I need a BADI instead of workflow

Statuses are at PD level - Status 1, Status 2

Scenario -

1.Dept 1 ticks Status 1 and Saves.

2.Dept 2 ticks Status 2 and Saves. Once saved, upon reopening the project builder for the same PD, Status 2 should be active and Status 1 should get unchecked.

We have 3 statuses for another process that are moving like this through a WF, but I intend to use a BADI instead. I have checked multiple BADIs( ZPS_PROJDEF_UPDATE,PROJECTDEF_UPDATE) but it is not working.

Please suggest which BADI is to be used.

Regards