Internal customer should be assaigned 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 assaign the supply source ( Delivering Plant).
Create a puchase order ME21N ---> Save
Delivery VL10 G ---> Calculation rule (appropriate) --> Assaign 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).