ADS momentum problem： differential ports for microstrip

hello every one,
i am designing a wilkinson power divider in ADS momentum, so to place a resister between the two output arm i draw a microstip line from each arm. when i insert port at the end of these microstrip lines, and trying to define the type of ports i get this message
" Port P4 cannot be associated with port number 5.
If they are in the same reference plane, and you want to associate them:
Please set both ports to the correct Port Type before
setting ^Associate with port number^ "

ok from reference plan i understand is either they are on the same x-axis or same y-axis, but how to resolve this issue, can any one help me.

Thanks in Advance
Best regards

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