iReport generating data redundantly

Hi,

I'm facing a problem with iReport. The problem is that the detail band is repeating depending upon the number of items in a transaction. For instance, if transaction 10 has 3 items, the detail band repeats 3 times spreading over 3 pages. And all the 3 pages hold the same data which shouldn't be the case. If there are 5 transactions with varied number of items under them, then all the 5 transactions should appear. But in this case, there are 15 pages generated with the same 5 transactions repeating again and again. For your information, the items under each transaction are generated through a sub report. I created a sub report to fetch the items for a particular transaction number and calling the same in the main report. Actually there is no direct connection between the transaction number and the items displayed. But not sure why the output is dependent upon the items in each transaction. Can anyone help me in this regards? Any help is highly appreciated.

Thank you!