These errors are usually produced by funds that had Interfund transfers in the statement period. When an Interfund is created, the destination's fund id is entered on the first line in the Description field of the associated Grant. This line must not be changed. If it does not contain, and only contain, the fund id then that is what is causing your errors. Check the grants from this last period and update the first line to include only the fund id. Then rerun your statements.