@Mariam – you do have to have management's authorization before sending out confirmations. Confirmations must be signed by management before they go to banks or to customers.
If other information is not consistent with the financial statements, materiality comes into play. Is it material? Is it material and pervasive? If its immaterial, you can still have an unmodified opinion. If its material but not pervasive, qualified opinion. Material and pervasive is adverse.
If management prevents you from obtaining sufficient audit evidence or you are unable to obtain sufficient evidence for any reason, then you will either issue a qualified or disclaimer opinion. You might even consider withdrawing depending on the situation.
@Qlad – a remittance advice ensures that your payment is properly applied to your account. In a perfect world, a company will separate the remittance advices from the checks when they are received. The accounts receivable department will match them up with the deposit and post the payments to the accounts.
AUD - 99
BEC - 97
REG - 91
FAR - 1/8/16