Exit to change Schedule line created

Hi,

Can you please let us know the exit name to change the schedule line created.

The scenario is as below:

- When the order is created in R/3 APO system is called for ATP check and based on the rules(Location Determination Procedure) when the stock is not available in the first plant maintained in rule it is being divided in the second plant.

Now the requirement is while checking if the second plant maintained in the rule if it has complete stock then instead of splitting the delivery it should be entirely picked up from the second plant.

For this I have checked in the exit EXIT_/SAPAPO/SAPLATPR_002 in which we can include the code to check the stock of remaining plants of the rule but it was not fetching the quantity entered in the order.

Can you please provide with a Exit by which we can handle the above scenario.