There is no authentication function when printing using CUPS on the network
(such as localhost: 631) while in OOo (version 1.2) is a pop-up window
requesting user name and password.
This is not a bug in cups-pk-helper, but a bug in the toolkit used to print. If the app is OOo, I suggest to file a bug against OOo.
Excuse me but the LibreOffice has this error nevertheless.
When both the network printer and CUPS configured and worked on other computer and if somebody wish print some documents from any applications authentication is needed. Before printing applications should open the necessary window so that users have possibility to enter one's name and password. OpenOffice knew to make it. Unfortunately, we guess this source code was erased from LibreOffice when this project was forked from OepOffice.org.