user exit already written

hello frns,

i am told that a program ( user exit ) is already written for a purpose,

and it is getting triggerred,

now my task is to find out which user exit is being invoked.

for example while saving the sales order, when the batch number

doesnot match, a reason is being shown,

now i need to find which user exit is bieng triggered, while saving this sales order.

thank you.