Filling of return

For fy 5-6 and 6-7 my client showed his income from chemist shop business which was below taxable limit. After that till today he is showing his income from insurance commission only which is again below the taxable limit in all those years. But during these years also he had income from his chemist shop. For fy 11-12 also he showed income from commission only. But now he want to revise the return for fy 11-12 and show his shop income also. Should he do so? Is there any chance for scrutiny assessment- of present year and past years.