Crystal report parameters from user table

Hi expert,

I need to design a Crystal report for get data from an user table ( [@myTable] )

Im Crystal report designer y design a report with one parameter:

"key@ select a,b from [@myTable]"

(I know that if parameter were "key@ select itemcode,itemname from oitm" ...its work fine.... because get values from oitm...so i required get data from [@myTable] )

SAP 8.8 PL20

Crystal Report basic for SAP Business One Version 12.1.3.1028

SQL 2008

Thanks in advanced

regards,

Alejandro Moran