Project WBS version - by: desperados

Hi,

I have 4 projects in my Projeqtor. The first is a simple test and has the number 1 id.
My principal project has the id #2 and all the WBS begins with 2.

I deleted the first project. But the WBS still begins with 2 for my principal project.

How can i do for make begin the WBS with 1 ?

Thanks !