Contribution Custom Currency Field in Values not displaying correctly

We have a Contribution Custom field set as a currency data type and dollar edit mask but don't seem to be able to get this field to display correctly in Analytics as a Value. It wants to count unique for each contribution record even if I change the formula to Sum.  It doesn't display what is entered in the field.  I could move it to rows but can't do any calculations on it there or display it as a currency.  Is it possible to use a currency custom filed under Values and if yes, what does one need to do to have it display with the real value entered in the field?