Hi Rudy,
Firstly its is not possible to delete or remove the system PLD from the DB, If you really want this requirement then you have to update the status of that particular system PLD. By using the Below Query. For Example In Sales Quotation screen this are the PLD No 'QUT20007' And dont want display in the system then set the status 'INactive' in that particular PLD.
And when user to try to get Print Preview So this 'QUT20007' are not display in that list.
You have to update the status only.By defaults status are ACTIVE.
This are the Query......
SELECT T0.[Status],* FROM RDOC T0 WHERE T0.[DocCode] ='QUT20007'
NOTE : PLease check in test DB.
Rgds,
Kamlesh Naware