More info: here's what I have in the Dataset Parameter Value

=Code.ReturnXML(Parameters!C.Value,"C","CUSTOMER","CUSTOMER_NUMBER")

but when I go look at the ExecutionLog the Parameter Passed is...

C=10165&C=10008&C=10162&C=10009&C=10007&C=10137&C=10179&C=10171&C=10002&C=10003&C=10001&C=10004&C=10154&C=10196&C=10005&C=10122&C=10153&C=10157&C=10006&C=10152&C=10125&C=10172&C=10214&C=10010&C=10159&C=10176&C=10055&C=10063&C=10126&C=10011&C=10012&C=10013&C=10020

I guess I would have expected it to either be not readable or in xml form...

Please - thank you...