Hi Nadeem,
The issue you describe seems a bit strange. Have you double checked your account structures that they are active and include all the financial dimensions? Please also check the budget module setup and the financial dimensions that you specified for budgeting. In addition, please have a look at the following site which might provide you some info on what you possibly missed: www.dynamics101.com/.../budget-register-entry-upload-excel-add-in-for-microsoft-dynamics-ax
Hope it helps,
Ludwig