In addition to describing the background of the catalogue, as well as how to use it and its structure, the guideline for using the system participation requirement catalogue also explains how to deal with different types of packaging, and contains information about its practical application. In particular, the guideline covers the application of volume/size limits, the definition of a sales unit, and details about transport packaging. There is also a description of how to deal with cases that are not set out in the catalogue. The explanations are accompanied by clear examples; the guideline also contains a section on frequently asked questions and a glossary. The guideline is part of the administrative regulation. Neither the abbreviated nor the full-length version of the catalogue should be used in isolation, but always together with the guideline.