Hi Unmudi
Before you start taking on recommendation to enhance SAP standard, can you please share what your selection criteria is for when you run this report.
As already mentioned by others the warning message is just that - a warning. It is advises the users that based on all of their selection criteria entries have been suppressed due to lack of authorisations. If the user specified a different selection criteria they may not receive the warning message.
To disable the warning message would risk erroneous interpretation of the results as the user may think they are seeing the full results for their selection criteria. If this was a SAP BI system the user would receive a no authorisations (all or nothing approach taken to avoid incorrect interpretation) and they user would need to then refine their selection criteria.
Regards
Colleen