Getting a red X not a yellow exclamation for a warning

I am not a good programmer so please feel free to tell me all the things I could do better…  :-)

I am working in 2021R1.

I have a field that I am validating to make sure that it does not exceed a total amount on the header record.  

My screen is functioning properly, but I should be getting a warning indicator, not an error.

My RaiseExceptionHandling is set at the Warning level BUT, I get a red X on the screen.  What am I doing wrong here?

        protected virtual void _(Events.FieldVerifying<GRGrantsCustomers, GRGrantsCustomers.allocatedAmount> e)
        {
            GRGrantsCustomers row = e.Row;
            GRGrants grant = Grant.Current;
            decimal? newValue = (decimal)e.Args.NewValue;
            decimal? total = 0;

            foreach (GRGrantsCustomers item in Customers.Select())
            {
                total += item.AllocatedAmount;
            }

            if (total - row.AllocatedAmount + newValue > grant.GrantAmount)
            {
                decimal balanceBeforeThisLine = grant.GrantAmount - total + row.AllocatedAmount ?? 0;
                string balanceAvailable = balanceBeforeThisLine.ToString("0.##");

                e.Cache.RaiseExceptionHandling<GRGrantsCustomers.allocatedAmount>(row,
                    balanceBeforeThisLine,
                    new PXSetPropertyException(Messages.AllocatedTooMuch, balanceAvailable, PXErrorLevel.Warning));

                e.NewValue = balanceBeforeThisLine;
            }
        }
This is what the screen looks like when I enter 600 in the second line.  It correctly sets it to 500, but it I want a yellow warning!