When sending IDOCs you need to use the library libSafeConnectToSAP in your model. The IDOC will be sent to SAP directly from there and is not using the separately deployed service SafeConnect that you would use to receive IDOCs.
Please check the persistent states in the Console and the logs. So you can see what is going on.
You may also send us your model to firstname.lastname@example.org so we can have a quick look on it.