Data carriers
The information the system exchanges between SuperOffice and the connectors is packed in what we like to call carriers. These are data-transfer-objects (DTOs). They have no methods/behavior.
The database schema is very similar to these data carriers, but it is not identical. For example, a price list in the database has a PricelistId field, which is not in the carrier because the carrier shall carry data from other systems as well. So the PricelistId field is put into the ERPPricelistKey field as a string by the SuperOffice connector.
All these carriers are defined in the SuperOffice.Plugins.DLL. They will not change after release, unlike the implementation classes stored in SoDatabase.DLL.
To keep these classes apart from the internal SuperOffice classes, we have suffixed the class names with "Info", like QuoteAlternativeInfo.