With the IGeneralInvoiceRequest interface all the invoice or reminder related data and parameters can be set by the available interface methods like SetPatient, SetTreatment,...
It is very important to add the service records (Tarmed, drug, lab,...) after all other invoice/reminder data e.g. addresses, treatment information has been set. If this ordering is not obeyed, some service parameters like the tax point value can not be correctly determined!
Alternatively to produce the data from scratch the data of a previously generated XML infoset can be loaded with the IGeneralInvoiceRequestManger::LoadXML method and thereafter changed appropriately.