The AO here may have failed to discharge his obligation to conduct a proper inquiry to take the matter to logical conclusion. But CIT (Appeals), having noticed want of proper inquiry, could not have closed the chapter simply by allowing the appeal and deleting the additions made. It was also the obligation of the first appellate authority, as indeed of ITAT, to have ensured that effective inquiry was carried out, particularly in the face of the allegations of the Revenue that the account statements reveal a uniform pattern of cash deposits of equal amounts in the respective accounts preceding the transactions in question