Sorting Group on the summation of two values

Question

I have a field (PharmacyTotal) in my report that takes the SUM of a field called Price:

[Sum(Price)]

I then have another field(LabTotal) that takes the sum of a LookUpSet like this:

=Code.SumLookup(LookupSet(Fields!Patient_Name.Value, Fields!FULL_NAME.Value, Fields!COST.Value, "DataSet3"))

This uses custom code that was sourced here.

I'd like to sort my group based off these two values added together. When trying to enter this as as a formular I'd like to sort off of:

=ReportItems!Textbox12.Value+ReportItems!Price3.Value

I receive the error:

A sort expression for tablix 'Tablix3' refers to a report item. Report items cannot be used in sort expressions.

Am I able to sort off of the addition of my two fields?

Answer 1

Sort Expression should look like : =(function which generate Textox12) + (function which is generate Price3) Also - you can add calculated field in dataset and sort your group by field.