Zero Balance Adjustment for Sales

Hi,
Currently I'm encountering some scenarios where there are some zero balance adjustments for the sales entries in the Cardex. After performing sales update, the zero balance adjustment entries would be entered into the cardex but no journal entries were generated for the GL side. Will journal entries be automatically created for sales? As based on what I know, the procurement zero balance adjustment would create journal entries. But for sales currently the journal entries aren't generated. So is this a bug or the journal entries currently won't be generated after doing sales update ? Assistance would be much appreciated. Thanks