If you have a lot of warehouses and move inventory between warehouses sometime you might need a more formal process to handle the transfer so you can use transfer orders. But sometime you just need a simple process to register the change in location so a transfer journal is a simpler process. There is a parameter on the site setup called “Use transfer journals for movement within site” that might be useful to look at if you want master planning to create a transfer journal instead of transfer orders. Here is a quick walk through of the effect of this parameter
Cheers
Lachlan