Purchase requisition profile

Hi

Hi Guys I have a problem in enhamcnent.

Currently I am setting external purchase req. profile in user exit BBPK0001 whenever purchase requisition created. This enhancement is triggering for each line item . My Here I need to add one more condtion. If the purchase req amount is more than 10000 USD we need to set the profile. But enhancement BBPK0001 is triggering for each line item. In the user exit i can't have total purchase requisition amount. Can you help me guys to fix this issue.

Regards

Ganesh