A list of value as parameter

Given the following SQL command:

SELECT cccid, cccname
FROM concarcxc
WHERE grcid IN (123, 125, 126)

I need to parameterize the list so that the command is something like

SELECT cccid, cccname, grcid
FROM concarcxc
WHERE grcid IN (${listofvalue})

I declare the parameter as string, but the report did not work.


Can anyone recommend me how to solve this problem?

Thanks