The current implementation of exclude process types from publishing has the side-effect, that a holdings record gets automatically suppressed as well if it only contains items which get suppressed based on the exclude from process types configuration.
E.g. if you have process type=acquisition, material type=issue, exclude=true all holdings which happen to only have items with material type issue in process type acquisition are suppressed no matter what. This is bad in itself, since it precludes the possibility of offering additional information to our users via the 866 field.
What makes things worse is that the bib record gets suppressed as well if the automatically suppressed holdings record happens to be the only one for the title and if you have the flag suppress bib with suppressed holdings set to true.
We understand that the current behaviour may be desirable to some, for us it necessitates weird workarounds including dummy holdings / dummy items. So we would urge ExLibris to consider making the suppression of holdings which virtually end up with no items an optional thing.
After all for regular holdings with no items we have a choice whether we want these suppressed or not. For exclude process types from publishing ExLibris made some assumption regarding the correct behaviour which for us simply don't apply.

Oliver Lehner
TU Wien library