Unable to pass blank value in request

Hi,

I am new to SoapUI, I am using SoapUI 4.6, and I have created a RestService.

I have parameterized my URL parameteres like : ( url:port/{api}/{customers}/{id}/{storedPaymentCards}


Now I need to execeute a case where I need to pass a blank id, so that my request would be like : (url:port/api/customers//storedPaymentCard)

This request is working fine in POSTMAN REST client but it is not getting executing in SOAP UI.

Please Let me know where is the issue and where I am wrong , I am eagerly waiting for early response.

Thanks and regards

Rakshit