Config Error 'Not Assign 5' -add new warranty type for warranty master BGM1

hi

i do config to add warranty type in BGM1, follow the sap link :-

- plant maintenance and customer service -> master data in plant maintenance and customer service

-> basic settings -> warranties -> define warranty types :-

5 Guarantor (customer) BLM-SAGA

but, in below link show 'Not Assigned 5' :-

- plant maintenance and customer service -> master data in plant maintenance and customer service

-> basic settings -> warranties -> define number ranges for warranty type

I dont know how to assign this number ranges for warranty type. Can anybody guide me to config this..

thanks