following this description on the use of auxiliaries: https://sourceforge.net/p/unicentaopos/discussion/1126901/thread/c4b57230/
When selecting "pizza base", the lower part of the window does not change to the auxiliary products as it is supposed to. To add the auxiliary product, I have chose the category manually and add the auxiliary product - it then shows up correctly in the list of sales items as auxiliary. When I have more than one product in the list and click on some product that has auxiliary products associated, the lower screen actually changes at it is supposed to. As I understand it, it should change in the moment I add the "base" product.
I also evaluated OpenBravo and there it behaves as expected.