Multiple User creating Production Order

Question:
Hi,
Here I am trying to build a logic to control the users creating Production Order at the same time. For Example 10 Users are trying to create the Production Order(PO) at the same time,I want to put them in the queue.But while creating the PO through User Exit same Batch Number is beeing assingned to 10 PO's. It is supposed to assign 10 different batch numbers. Has anyone face this similar problem? Pls help me to solve this problem.
Cheers
AAV
Answer:
try using number range object..... in user exit.

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