When you exclude MRP planning for a storage location, SAP will not consider the stocks when
you do a delivery creation.

You used SM30 - V_T001L_D to include/exclude the storage location for MRP.

If you does not wish to include/exclude the storage location for all the materials, you can
just goto MM02 -> MRP View 4 to include/exclude it for that particular materials only.
 

Take note that when you set the parameters in SM30 - V_T001L_D, the settings only affect
those newly created materials starting from the days you set the parameters.
 

For those materials already created, you have to changed it manually one by one or write an
ABAP program to mass changed it automatically.
 

Best regards,
SAP Basis, ABAP Programming and Other IMG Stuff
http://www.sap-img.com