The data logic of lot controlled items in WIP Backflush process

Hi All

11.5.10

In WIP backflush process, lot controlled items transaction logic is what?

Where can get the source code of lot controlled items in  WIP backflush process? Can I get source code from package WIP_AUTOLOTPROC_PRIV?

Example: One lot controlled component , onhand qty=5 with lot number A and B in same subinventory&locator, supply type is operation pull , required qty=1

Now do WIP move transaction, backflush transaction done for this component, lot number is A.

Thanks

Fengling