How to correct entries in A/P Detail that should not be there

I have an error on accounts payable detail report. The bill and the payment both show on the report and one as a credit, one as a debit? 

On the >90 section I have two line items as follow:

Bill Pmt -Check  01/17/2009   1697  A T & T                                       -46.89

Bill                         01/17/2009              A T & T         01/17/2009            46.89

 

I also show one entry as follows:

Bill Pmt -Check      06/17/2009    1717     CNA                                      -100.00

                                                                                                                 ____________

Total > 90                                                                                                     -100.00

                                                                                                                 ============

  Does anyone have an idea how the error was created, and/or how to correct it?                                                                                           -