Deadlocks can occur at two times during the QBF Update function. First, a deadlock can occur while you are editing rows of retrieved data. QBF displays the following error message:

This means that you cannot update any more rows retrieved by your last query. However, any changes you have made before this point are still stored in the buffer. In this situation, QBF displays the following message:

Answering y (yes) is equivalent to selecting the Save operation. As QBF writes your changes into the database, it displays the message:

The second type of deadlock can occur during the Save operation while your changes are being written from the temporary storage buffer to the database. In this case, QBF displays the message:

In this situation, all changes made since the last Save operation are lost and you must begin again with a clear form.