CLDC-1218: Fix hbrentshortfall import (#558)

* Infer hbrentshortfall not known if tshortfall not provided and overridden

* Reorder import

app/services/imports/case_logs_import_service.rb

@@ -125,8 +125,8 @@ module Imports
       attributes["supcharg"] = safe_string_as_decimal(xml_doc, "Q18aiv")
       attributes["tcharge"] = safe_string_as_decimal(xml_doc, "Q18av")
 
-      attributes["hbrentshortfall"] = unsafe_string_as_integer(xml_doc, "Q18d")
-      attributes["tshortfall"] = tshortfall(xml_doc, attributes)
+      attributes["tshortfall"] = safe_string_as_decimal(xml_doc, "Q18dyes")
+      attributes["hbrentshortfall"] = hbshortfall(xml_doc, attributes)
 
       attributes["voiddate"] = compose_date(xml_doc, "VDAY", "VMONTH", "VYEAR")
       attributes["mrcdate"] = compose_date(xml_doc, "MRCDAY", "MRCMONTH", "MRCYEAR")
@@ -520,11 +520,15 @@ module Imports
       ((2..8).map { |x| string_or_nil(xml_doc, "P#{x}Rel") } + [string_or_nil(xml_doc, "P1Sex")]).compact
     end
 
-    def tshortfall(xml_doc, attributes)
-      shortfall = safe_string_as_decimal(xml_doc, "Q18dyes")
-      return 0 if shortfall.blank? && attributes["hbrentshortfall"] == 1 && overridden?(xml_doc, "xmlns", "Q18dyes")
-
-      shortfall
+    def hbshortfall(xml_doc, attributes)
+      shortfall = unsafe_string_as_integer(xml_doc, "Q18d")
+      if attributes["tshortfall"].blank? && shortfall == 1 && overridden?(xml_doc, "xmlns", "Q18dyes")
+        # If they have said there is a shortfall but then not entered one, and that has been
+        # manually overridden we instead infer that they actually didn't know whether there is a shortfall.
+        3
+      else
+        shortfall
+      end
     end
   end
 end