Manufacturing - configuration - default warehouse material line

hi All, 

I am using configurator in my production order and I want the system to use this specific warehouse to issue the material from shed 2 if I select 1022 item

when I create the production order and I check the detail it is not assigning the one I had used on my configuration and instead used the warehouse on the finished good item. on the header of production order maintenance! why is that ? this is not what I am expecting based on the help.

thanks for your help in advance 

Ghazal