Outbound IDoc for Shipment via Logical System

Hi,

I created an outbound IDoc for shipment and set a logical system ECC60CXXX as partner. However, at the output of VT02N, when I added the output type defined, the sold-to-party was imported automatically as the partner number. If I changed it to the logical system number I wanted to use, an error said '

Maintain outgoing EDI-connection data for partner ECC60CXXX'. How can I set the partner number to the logical system?

Best regards,

ts