If you choose to connect to SAP using Remote Function Calls, Brainware for Invoices requires SAP .NET Connector 3.1 for x86 (32 bit) to be installed on all machines running the solution. The minimum version of .NET Framework that is required for the connector is .NET Framework 4.6.2. You do not need to install the SAP .NET Connector if you only want to connect to SAP using web services.
You can download this connector from the SAP Service Marketplace. The download is in the form of a zip file called sapnco31P_3-70002626.zip.
Once downloaded, complete the following steps to install and set up SAP for Brainware for Invoices.