Need help on adding parameters for Rest request

I am new to SoapUI. I came across one scenario where SoapUI does not allow adding multiple parameters with same name. I tried adding it to the Method.

Am I missing something?
Is there a work around if this is a known issue?

I am using SoapUI 4.5.1
Sample request
host:port/service/resource?parameter1=value&Parameter2=value&Parameter3=value1&Parameter3=value2&Parameter3=value3