Defining number range for CRM Visit Planning

Hi

I wanna define  number range for a field in CRM Web UI visit planning. E.g.  from 1000  to 1999  .

I have tried  something but it doesn't work .

I firstly tried that : SPRO --->  CRM --> Transactions  --> Basic Settings --> Define Number Ranges

After that I chose  ' Number Ranges for Activities ' .  And defined a number range .

Secondly   : SPRO --->  CRM --> Transactions  -->Define Transaction Types .

Transaction type : CX04 .  I chose transaction and there is a field that name is  " Int.No.Range No  " .

I chose my number range id by search help  after save it . But as I say it doesnt work .

What is the way to do it ? If anybody helps , I will be grateful .

Thanks ,

Mehmet