This message is displayed by design. Write-offs are not actually independent records and so cannot be opened directly from the results screen of the query. 

In order to open the write-off form, follow the steps below: 

1. Create a gift query with the following Criteria: 
 +Gift Information, Gift type equals Pledge 
AND Pledge Balance greater than $1 

On the Output tab, select at least one output field such as Gift Amount or Gift Date 

2. Highlight one the rows and open the Pledge. 
3. Select Installments/Payments tab 
4. On the Installments/Payments tab, highlight the row with Write-Off under the Gift type 
5. Right-right click on this row and select Go to Write-Off 

The write-off screen for that particular installment will appear.