How to get sort of items base on prompt values?

Hi all,
Could anyone help me with this issue: I 've got report in Rep studio, cognos 10.2. with Select & Search Prompt. It is used by user to put there more values and show them in list later. But user want to show values in list in order how he put them into prompt. I am not able to get them in that order as that order of items isnt saved anywhere. Thank you for any help or suggestions.
I tried it through ParamValue, ParamDisplayValue, but all of them are report function only for Layout calculation and cant be used in query calc.