[GNC] Possible Bug in Credit Note Display

[Robert Simmons]

In the Entries part of an open credit note tab, the row focus can be
assigned by clicking on a row. This changes the selected row from green to
yellow. Also, it changes the value in the Subtotal column to zero. This
appears to just be a software defect in the display: there are no changes
made to the underlying data in the database. If you select a different row,
the previously selected row's subtotal returns to normal and the newly
selected row's subtotal changes to zero.