Taxpayer's Investment Manager requested (5) distributions in 2023 instead of (4). Taxpayer returned the last distribution that was received 12/31/23. Taxpayer was not provided with a Corrected 1099-R. 

The investment manager said he would not be given a corrected form and to show the total distribution in box 1 and reduce the taxable portion by the amount of the extra payment. I am assuming this will trigger a letter. Should there be an explanation attached to the return explaining the difference?