Lumped port definition problem in HFSS 11

Hi everybody,

I am using hfss 11 and finding a problem in defining lumped port. In between a PEC bridge and a conductor, I have drawn a sheet and trying to define lumped port on that. But sometimes, the window appears which prompt for a terminal line; whereas sometimes, another different type of window appears prompting for integration line.

Since I am new in HFSS, I am unable to understand the dual nature. Please somebody help me to rectify the errors I must have been making in defining the port.....

I think this is caused by the solution type you choose in HFSS. Terminal or Modal.