The Heureka .NET API provides a high-level wrapper interface to a subset of functionality in the Heureka Forestry DSS core libraries (DSS = Decsion Support System). To use the API, you need to install it. The required DLL-files from the core libraries are included in the API installation package.
The documentation includes documentation on some classes, methods, properties and enumerations in the Heureka core assemblies Slu.Heureka.BaseLayer and Slu.Heureka.DomainLayer. For example, tree species codes belongs to the DomainLayer, and are needed when populating input data objects used when calling the API functions. However, you should indeed avoid making direct calls to functions in the BaseLayer and in the DomainLayer, since these are intended for internal use and may be subject to changes, which could break your code.
See Installation
One of the target platforms
.Net framework 4.5.2 or later