Hi Susheel,
Can you tell me that is the material general plant data was extended after processing the order or it was done before. If it done before the updation it wont reflect. when you do a delivery.
Is this happening for only 1 document or all the doc.
If other thing are ok Please check the assignments also. plant and storage location.
please check these also
Define Rules for Picking Location Determination. Here you have to assign the MALA rule to your delivery type. Also maintain in OMJ8 or OMB2