special procurement 80

Dear All

         I'm  learn the function assembled to another plant。I have test the stand special procurement 80，and set the strategic 40 for FG。I want to achieve the function like that ：receive sales order in plant 1000 but product in plant 4000。

but I failed；can anyone give me some document about this function ，maybe some mistake in my configuration at spro 。

please help me

thank you very much！