This is the ValueSet that contains all the codes in EDQM - Unit of Presentation (http://fhir.ch/ig/ch-epl/ValueSet/edqm-unit-of-presentation) and EDQM - Unit of Presentation (http://fhir.ch/ig/ch-epl/ValueSet/edqm-unit-of-presentation). E.g. what you have to deal with if you get resources containing codes in either of them