Hi jeyaganesh,
I dont have if have sense but, do you know if it can to be a authorization error that dont allow you to Business Administration tab?
When you enter here, check in SU53 if SAP are asking you any SolMan authorization object, value, etc.
In the other side, if it are not an authorization error, maybe can to be a customization issue.
I hope that it can to be the problem and you can solve it soon.
Best regards.