Let's say you want to pack a material shirt_jai in test_pack.
Using MM01, create material type=packaging test_pack
Define Packaging Material Types
Let's say JPAC. The settings that I chose:
Plant determ. - Plant is entered manually in handling unit
Pack. matl. cat. - Packaging materials
Generate Dlv. Items - blank
Number assignment - Number range interval 'HU_VEKP'
Define material group for packaging material
Let's say JGRP