private void TweakThenSave(SoaRowDTO dto)
{
dto.DocRefType = this.GetType().FullName;
dto.DateOffset = TransactionDate.SoaRowOffset();
dto.Amount = Math.Abs(dto.Amount)
* (IsDeposit ? 1.0M : -1.0M);
_repo.UpsertAndUpdateBalances(dto);
}