Ok, I learned from Internet source that EWM is the part of SAP SCM package but not ECC.
I had ECC ERP. Though there are some nodes for EWM is present in ECC but the entire solution of EWM is based on SCM Net-weaver package.
I have seen so many views on my posts. But none of them replied to me.
I guess everyone was assuming I have SCM package installed.
I just needed the information I shared above (via my findings from Internet).
Hope this is helpful for other people new to learn SAP EWM
Thanks