In case if you want to abort posted packing slip for Sales order, there is a way here. In the following screen print, SO is packing slip posted;
To cancel the packing slip, click on the above mentioned highlighted menu ‘Packing slip’. System opens the following form;
Click on Cancel;
Once ‘Cancel’ is clicked, system throws the following info message;
Click ‘Yes’ & system cancel the packing slip.
System also enabled back ‘Packing slip’ menu button. See the following screen;
To reconfirm if packing slip is cancelled and quantity is not delivered, refer the following navigation;
Accounts receivables-> Common -> Sales orders -> All sales orders -> Select related sales order -> Click on General menu -> Click on ‘Line quantity’ menu button
See the highlighted field where system shows deliver remainder is 1 i.e. packing slip is successfully cancelled.
P.S. Once order is invoiced, you can not use this functionality.