Interchangeablity Groups

Dear Gurus -

I am trying to use the product interchangeability functionality and when I create a new Group and try to save it, I get the below message:

+For object /INCMD/GRP , number range interval 01 does not exist +

and when I go into the details of this message, It says

For object /INCMD/GRP , number range interval 01 does not exist

Message no. NR751

Diagnosis

The database table NRIV has the delivery class 'C', i.e. the SAP default settings are only in client 000.

Procedure

Create the missing number range interval in customizing.

Transaction code:

Where should I exactly create the number range interval for this kind of master data? I can only find the number ranges for orders in SPRO customizing..

appreciate your help!

Varun