Generate Idoc for Payment Method C (Check)

Hello Gurus

We are Using Idoc PEXR2002 with Message type "PAYEXT" for outgoing Payment. I am trying to generate Idoc for payment method 'C' which is Check in order to see if it is creating the Check Number in the Idoc. Can somebody guide me what I need to do in order to accomplished this task. I could easily generate Idoc for Payment method 'T' which is outgoing Wires but some reason it is not creating idoc for payment method ' C'

Any advice?

Thanks in advance