Crystal Formula for Purchase Orders

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I'm trying to create a formula that recognizes the individual jobs within a Purchase Order. For instance, on the header I want it to say "See Below" on the Job Number if there are different job numbers on the PO otherwise I want it to print the job header job #. I tried If (podetail poline is > 1 and podetail job <> poheader job then "See Below" else poheader job but doesn't work...