Hi Mahesh,
Have you followed step for Creation of Chart of Account?
1. Define Operation of Chart of A/c - Tocde - OB13 ?
2. Define GL Account Group T code - OBD4 ?
3. Define Retained Earning A/c - OB53 ?
4. Assign Chart A/c to company Code - OBY6 ?
After all these step completed then you can create New GL Account !!!
let me know any Queries
With Regards,
Ganesh