Hi,
Try to debug the 'IF_CRM_IC_ACTION_HANDLER~PROCESS_RETURN' method of your transaction launcher class. Here you can find the customer number coming from ECC.
First you need to pass your newly created customer number from ECC to CRM in some parameters. For this you may need to create parameter in your BOR Object and do some code to pass the customer.
Interaction record is not created automatically , but the data comes into activity clipboard automatically. and then either we can save the interaction record manually or it will automatically saved when the agent ENDS the interaction in Interaction center web client.
Thanks
Kumar Gaurav.