When I try to post a reversal to a credit memo invoice it lets me enter the PO. date, negative check amount, check #(Chk#2), and deposit no., I select "Reversal" and the bank account. Then I get the following error message "You have tried to access a file that has not been previously opened, or the file number value (FNUM) passed was 0."
 
What does this mean? Our accountant runs classic and it works just fine for her.  
 
Also I have to then go back into the the AR-C (I enter 0.00 for the amount Chk#1), go to the Open AR Items screen and pick the negative amount associated with the invoice and there is a positive amount listed for the same amount without a invoice number listed. When I pick both they cross eachother out and the screen is exited.  
 
When I review the payment history in AR-R it shows two seperate entries.
 
 
Bank Account: CASH IN BANK, GENERAL ACCOUNT    
Chk #: 2          Date: 02/20/06
 
NEWPIP  0    02/20/06  $1,000.0    $0.00    -$1,000.00    
                                                          == =========
                                                       $0.00     -$1,000.00
 
 
Bank Account: CASH IN BANK, GENERAL ACCOUNT    
Chk #: 1          Date: 02/20/06
 
NEWPIP 16778 02/20/06  -$1,000.00 0.00  -$1,000.00    
NEWPIP   0       02/20/06     1,000.00  0.00     1,000.00
                                                            ===  ========
                                                         $0.00          $0.00
                                                                                                                        GRAND TOTAL     $0.00     -$1,000.00