Hello OM,
Whatever Vidyanand said is correct. But I would like to add more which will make you to understand the concept.
Whenever you want to transfer the stock logically or physically then in WM we need to have some reference document. either TR or PCN(Posting change notice). TR has limitation as, it can be created with in one plant with only one wh sloc. In other word, we can not use two different sloc in TR. Therefor we can not transfer the stock from one sloc to another sloc belonging to same warehouse using TR.
Whereas PCN there is provision to use two different WM manged sloc and hence can be used across two WM managed sloc In this case, there will be two line items created in PCN.
You can check the process using manual PCN process with LU01 transaction. If you look at transaction LB01- creation of TR then you will find that there is no provision whereby you can use two different WM managed sloc.
Hope your doubt is clear.
Thanks,
Milind Chaudhari