Fill the fields on the top right for the logical target system and the technical settings for the RFC destination as defined in DeltaQ Customizing.

deltaq-tech-settings

Log. Destination is the logical RFC target system (check step 1 in the DeltaQ Customizing).

Gateway Host is the Name (or IP address) of your SAP system of your SAP system.
Be sure that the Gateway Host is the same as in your SAP Connection.

Gateway Service is generally sapgwNN, where NN is the instance number of your SAP system, i.e. a number between 00 andd 99.
NN must have the same value as the field System No in your SAP connection or instance number in your SAP Logon.

Program ID is the name of the registered RFC server (check step 4 in the DeltaQ Customizing).

The values Gateway Host and Gateway Service corresponds to the following SAP connection.

sap-conn-app-ecc

Now click on the Customzing Check link to validate the DeltaQ Customizing on the SAP system.
Be sure that all lines are green.

customizing-check-successfull