Color expression error - Operator '=' is not defined for types Microsoft.ReportingServices.ReportProcessing.ReportObjectModel.Field and Integer

Hi all,

I am trying to set the Color property on a text box based on a KPI status indicator returned from an SSAS KPI.

My expression is:

=Iif(Fields!Orders_DIFOT_Percentage_Status_ = -1, "Red", Iif(Fields!Orders_DIFOT_Percentage_Status_ = 0, "Orange", "Green"))

When I run the report I receive an error: The Color expression for the textrun 'Orders_DIFOT_Percenage_Value.Paragraphs[0].TextRuns[0]' contains an error: [BC30453]  Operator '=' is not defined for types 'Microsoft.ReportingServices.ReportProcessing.ReportObjectModel.Field' and 'Integer'

Appreciate your assistance.

Clay