Purchasing number ranges

Hi All ,

I am getting a problem in my IDES ,

I am creating new number range for PR or PO , it is getting created and when i assign it to document type i am getting error "please enter internal/external number range" ,

system is shown the value of number range wnhen i do F4 on the internal or external field ,

i carried out same in DR1 server and its working fine

please let me know is there any data error