Adding Multiple Requisitions to an Insight Report

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Does anyone add multiple requisitions within the parameter section in the "Design Report Layout" area?  I am able to get a report when I use only one parameter value but when I try to add a second value, the information is unavailable.  I have used job codes with the following formats:

=job code 1+job code 2

=(job code 1+job code 2)

job code 1+job code 2

job code 1 + job code 2

job code 1, job code 2

and none have provided the necessary data.  The report didn't provide a drop down menu to select the values, hence the trouble with trying to input the correct value language to produce the report data needed.