How to control the default infotype start date when executing an action?

Dear all,

I have a custom Infotype, which start date should always before the hiring date and so we want to leave the start date blank which creating the relative Infotype.

I have already done the configuration in V_T582A such that the start date provides no default value when creating the new Infotype in PA30. However, the hiring date is still being defaulted when the Infotype when being created in an hiring action. Before I go to user exit programming, is there any place I can do relative configuration?

Thanks,

Steven