Description of problem:
Customer has the following business scenario: The goal is to enforce top level budget control with ability to overrun on the project budget lines amount. As such, Subproject budget should allow overruns, but not beyond the Top Project Budget.
Engineering team explanation:
The Budget control setup under every Project is specifically for it only. It invalidates the main setup from the Project management and accounting parameters which are applicable for all the projects. So as it is in your scenario the Budget control setup of every subproject invalidates every other setup for Budget before that or in other words said: the “Disallow overruns” of the main Project is no longer applicable for its subprojects as their Budget control option is changed to “Warn of overruns”.

User would like to have the option to enforce top level budget control with ability to overrun on the project budget lines amount.