int type = ...;
string id = "...";
string journal = "...";
Int64 piece = ...;
MercatorUi.Engine.Gescom.Tools.BillingDocDescriptor billingDocDescriptor = new MercatorUi.Engine.Gescom.Tools.BillingDocDescriptor(MercatorUi.Engine.Gescom.Billing.TypeVAEnum.V, type, id, journal, piece);
MercatorUi.Reporting.ReportingStatic.PrintBilling(billingDocDescriptor, MercatorUi.PrintPrevEnum.Print);