Hi,
Have you checked your HU material and material to packed both having stock in Inventory.
Even check the table HUMSEG is correctly updated or not.
check this table correctly Hu assignd to you material and created materil document or not.
check for for material master clearly for both material like plant, storage location, batch etc..
Ask your MM consultant to check all entry is correct in material master and delivery or not.
Regards
Karthik.