Hi Akhil,
As per your comments, you are trying to run a scenario where based on the material you are picking should be always from 802 storage type and hence you have assigned it at the movement type level - source field.
Once you maintain a storage type at movement type level, system will consider this as an interim and you can see that in LX20. Check the message at LX20 for your warehouse. However there is not much difference for interim and regular storage type.
I have few questions here,
1. What is the exact requirement for this assignment at movement type level?
2. Did you maintain for dynamic/fixed bin?
3. What is the picking strategy defined for this storage type?
Regards.