We had the exact same situation in that it did not help to change the Payer slightly or make another change except the amount. After four attempts - I was determined not to change the amount on one of the 1099-Rs even though the withholding was different. In the end after three tries, it was not accepted until I changed one of the 1099-Rs by adding a penny. It was accepted in 13 minutes. It is all about the total amount of the RMD.
