prevent applying cost filter when money value is requested

But we need to store it so that the unit is persisted.

app/controllers/cost_reports_controller.rb

@@ -197,11 +197,11 @@ class CostReportsController < ApplicationController
   # Determine the active cost type, if it is not labor or money, and add a hidden filter to the query
   #   sets the @cost_type -> this is used to select the proper units for display
   def set_cost_type
-    if @query
+    return unless @query
+
     @query.filter :cost_type_id, operator: '=', value: @unit_id.to_s, display: false
     @cost_type = CostType.find(@unit_id) if @unit_id > 0
   end
-  end
 
   #   set the @cost_types -> this is used to determine which tabs to display
   def set_active_cost_types

app/models/cost_query/filter/cost_type_id.rb

@@ -38,6 +38,17 @@ class CostQuery::Filter::CostTypeId < Report::Filter::Base
     @display
   end
 
+  def field
+    # prevent setting an extra cost type constraint
+    # WHERE cost_type_id IN (...)
+    # when money value is requested
+    if values == ["0"]
+      []
+    else
+      super
+    end
+  end
+
   def self.available_values(*)
     [[::I18n.t(:caption_labor), -1]] + CostType.order('name').pluck(:name, :id)
   end