Correct error message string

config/locales/en.yml

@@ -66,7 +66,7 @@ en:
       void_date:
         ten_years_before_tenancy_start: "The void date must be no more than 10 years before the tenancy start date"
         before_tenancy_start: "Void date must be before the tenancy start date"
-        after_mrcdate: "Void date must be after the major repairs date if provided"
+        after_mrcdate: "Void date must be before the major repairs date if provided"
       offered:
         relet_number: "Number of times the property has been re-let must be between 0 and 20"
       la: