When we will use the Backflush Trasfer Transaction Type

In the navigation INV-> Transactions -> subinventory transfer . subinventory transfr window will open in the TYPE field , in the LOV we will have two types of transfer Backflush and subinventory Transfer . In this when we will use the Backflush Transfer . pls check the attached file Thanks in advance

subinventory Transfer :

subinventory Transfer : Transferring material from one sub inventory to another sub inv...like store to floor stock ..etc Backflush transfer : Backflush is consumption of material in WIP