When using the RFC interface for the SAP barcode transfer workflow you get the message "Name or Password is incorrect"

Despite successfully finishing the configuration to use the RFC interface of CONNECT to SAP, you will get an error message "Name or Passor is incorrect", if you use it. Due to technical reasons the RFC interface converts all password in capital letters before transferring it. Please use only passwords in SAP, which are completely written in capital letters to avoid problems.