miro, mlpp: send to external adress

Hello,

is it possible to send this message (mlpp) to an external adress (medium 5)?

If i use the Programm RSNASTSO and Form-Routine SAPOFFICE_AUFRUF with medium 5 i get the following error:

Document <Preisabweichung in Rechnung &RBKP-BELNR&> could not be sent

Message no. SO654

I hope somebody can help.

Thanks

Johannes