Hello
Yes, it should be necessary to consume the budget twice on different WBS with the same cost.
Some projects are made centrally by a company for all other companies in the group. So at the end of the projects, costs are rebilled to other companies.
But for the amount of costs that remains in charge of the same company that realizes the project, it should be traced on a specific wbs. So budget should be consumed on both.
We are checking also with business, but we should find a solution without rethink all the process.
thanks