Determining Quantities for Batch Splits/Parts to be Discontinued 
Requirements or stocks are reduced sequentially in the quantity determination for batch splits or discontinued materials during backflushing .
In detail:
The batch stocks for a material are reduced according to the sequence in the component overview for the order. This means the consumed quantity of a component is withdrawn from the first batch, till the planned requirements quantity is achieved. Afterwards, withdrawals are made from the next batch.
The sequence of the batches in the component overview is determined by the sort in the batch search strategy.
Example
You have carried out a batch split for material MAT-1. The requirements quantity for batch BT-1 is 30 pieces and for batch BT-2 is 10 pieces (total requirements 40 pieces). You make a partial confirmation and a final confirmation for half the order quantity in each case. In the partial confirmation 20 pieces are withdrawn from batch BT-1. During the final confirmation 10 pieces are withdrawn from batch BT-1 and 10 pieces from BT-2.
In the case of simple discontinuation, the stock of the material to be discontinued is used first, then the new material.
Example
MAT-3 is the follow-up material for MAT-2. There are 30 pieces of MAT-2 still in stock. 40 pieces of MAT-2 are required by a production order. After the availability check, 30 pieces MAT-2 are reserved for the order. The remainder of 10 pieces changed to MAT-3. You make a partial confirmation and a final confirmation for half the order quantity in each case. In the partial confirmation 20 pieces of MAT-2 are withdrawn. In the final confirmation 10 pieces of MAT-2 and 10 pieces of MAT-3 are withdrawn.
In the case of parallel discontinuation, the stock of the main discontinued part is used first, then the stock of the new material(s).
The discontinued/new materials should be treated in the same manner in backflushing; that is, either all material or no material is backflushed.