Hi David & Michael:

{% Comm} is a calculated colum. I tried Michael's suggestion - and it worked. I guess, I overly complicated things by using the 'True Amount' calculated column to calculate the commissions - thinking that I couldn't use the Total Dollar Value field since it always returned positive amounts. I guess, as Michael pointed out: GridView knows which numbers are positive and which are negative. It just always displays them as positive - no matter what.
So, using the Total Dollar Value field will result in a negative commission if it's a credit note. It's just confusing that it doesn't display the Total Dollar Value (in my opinion) properly.
Thank you all for your help! Going home now...

Andre ;-)