User Exit for Transaction QM01 & VA01

Hi experts,

I have a requirement such that the newly created QM Notification number(QMNUM) from QM01 will be exported to a memory ID and imported in transaction VA01 such that the Sales order(VBELN) will have the same value of Notification number(QMNUM). QMNUM = VBELN.

QM notification number and the Sales Order number to be created for each claim filed by a customer should be the same. This is being done in QM01. The problem is that when this is done in BDC, we cannot simply "copy" the notification number in QM01 into the sales order number of the linked Sales order that is being created.

Need a User Exit for this. Thanks.