If you have posted a packing slip but you want to abort it, there is a way here. In the following screen print, PO is packing slip posted;
To cancel the Product receipt, click on the above mentioned highlighted menu ‘Product receipt’. 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 ‘Product receipt’ button. See the following screen;
To reconfirm if packing slip is cancelled and quantity is not shipped, refer the following navigation;
Accounts payable -> Common -> Purchase orders -> All purchase orders -> Select related purchase order -> Click on General menu -> Click on Line quantity menu button
See the highlighted field where system shows deliver remainder is 10 i.e. Product receipt is successfully cancelled.
P.S. Once order is invoiced, you can not use this functionality.