The Auditors's opinion can be modified in three ways (which are mutually exclusive) as well covered under Standard on Auditing 705 - Modification in an Independent Auditors Report. These are
1. Qualified - When there is a material misstatement with regard to an item or number of items in financial statements having limited impact on the financial statements as a whole.
2. Adverse - When these material impacts are not limited but pervasive.
3. Disclaimer - When the auditor is unable to form the opinion due to lack of sufficient and appropriate audit evidences required to form the opinion.
Please refer three Standards on Auditing issued by ICAI and also mandatory under Companies Act 2013 which are 700, 705 & 706 for detailed study or share your full facts to enable me to form my considered view.