Unfortunately, my client has Efficy 10SP2 and the macro <%OnUserGroup%> is not available.
Is there some way to do the same thing in 10SP2 ?
Or should I to check this with a SQL request ?
No, there isn't. You need to simulate the missing function tag in this old version with a serverscript.
I hope that the function isCurrentUserInGroup is available in 10 SP2