Hello aspirant

hope you are doing well and safe. With reference to your query,  I would glad inform you that this can might be issue while verifying the registeration for admit card . I would advise you to mail a gentle apology to authorities  of du mentioning that you have dont have certificate for now ,so I uploaded  income certificate to be in safe zone . Attach the underatking mentioning that you will provide latest certificate at the time of admission

Hope you found this answer informative. Best wishes for your future