hi manoj,
please check the following settings.
- defining packing material in VHAR and also check
Material group for packing material in logistics-general -handling unit management-basics-define allowed material packing material.
2. check whether the packing material and packing material is assigned to the material(mm01) in sales general plant tab.
3.Aslo tell me whether your are using serial number for the material .incase if you are using serial
number.you have use same serial number you use number for returns.also.
4.while packing you have select both material and packing material together and click for packing.
Edit pack
check all setting and also check the what is movement type that you are using.hope this will resolve your issue.
regars
satish