Dear Sankar,
Kindly schedule your qty as per delivery qty creation is under Delivery Schedule tab and try to do VL10B.
Ex - Since PO created for 20/33/23, schedule it 20(19.12.14) / 20(19.12.14) and remaining 13(Future date) and 20(19.12.14) & remaining 3(Future date).
OBD will create only for 20/20/20.
Hope you clear..
Regards,
Karna J