Configure Intercompany Stock Transport Order

Material should exist in both the plants (Delivering & Ordering),
Internal customer should be assigned to the ordering plant ( MM -> Purchasing -> Purchase Order -> Setup stock transport order -> assign the internal customer to the ordering plant and assign the Sales area of the internal customer. Assign its Sales area to the delivering plant Assign the document type and Delivery type NB and NLCC Assign the Supplying plant --> Receiving Plant --> NB Take the delivering plant and assign the sales area. Vendor master has to be created and assign the supply source ( Delivering Plant). Create a purchase order ME21N ---> Save Delivery VL10 G (VL10B) ---> Calculation rule (appropriate) --> Assign the purchase order number here and execute. Select the Delivery creation line and do the back ground process. Start the log display and see the delivery document number by the documents button Goto VL02N --> do picking and PGI --> Then do the MIGO with respect to the delivery document. Billing (Intercompany pricing conditions should be set).
Vendors should belong to the pur org of reciving plan

customer should be created for the sales area of supplying plant

Sales area you should assign to the supplying plants

where in you define that sales can happen from the supplying plants

u r talking abt vendor now...vendors are mapped to supplying plant in XK01 -> purchasing view -> add purchaing data