check if tshortfall is overridden

app/services/imports/case_logs_import_service.rb

@@ -516,7 +516,7 @@ module Imports
 
     def tshortfall(xml_doc, attributes)
       shortfall = safe_string_as_decimal(xml_doc, "Q18dyes")
-      return 0 if shortfall.blank? && attributes["hbrentshortfall"] == 1
+      return 0 if shortfall.blank? && attributes["hbrentshortfall"] == 1 && overridden?(xml_doc, "xmlns", "Q18dyes")
 
       shortfall
     end

app/services/imports/import_service.rb

@@ -22,6 +22,10 @@ module Imports
       xml_document.at_xpath("//#{namespace}:#{field}")&.text
     end
 
+    def overridden?(xml_document, namespace, field)
+      xml_document.at_xpath("//#{namespace}:#{field}").attributes["override-field"].value
+    end
+
     def to_boolean(input_string)
       input_string == "true"
     end