Suggested values in enum column type

[yousoufautomati]

Hello

In my if i enter the group number the list of students will be shown in the next column. I made that column type Enum and wrote this formula in Suggested values:

SELECT(CRM[Ism va Familya],[Guruh raqami]=[_THISROW].[Guruh raqami])

But this is showing only some groups list of students, some groups' students list is not showing.

What is the problem?

[Tommy62]

Vielleicht das Leerzeichen in [ Guruh Raqami].

SELECT(CRM[Ism va Familya],[Guruh raqami]=[_THISROW].[Guruh raqami])