due date exists.

src/clj/auto_ap/graphql.clj

@@ -262,6 +262,7 @@
               :status {:type 'String}
               :expense_accounts {:type '(list :invoices_expense_accounts)}
               :date {:type 'String}
+              :due {:type 'String}
               :client_id {:type 'Int}
               :payments {:type '(list :invoice_payment)}
               :vendor {:type :vendor}
@@ -541,7 +542,7 @@
               :invoice_number {:type 'String}
               :expense_accounts {:type '(list :edit_expense_account)}
               :location {:type 'String}
-              :date {:type 'String}
+              :date {:type :iso_date}
               :client_id {:type :id}
               :vendor_id {:type :id}
               :vendor_name {:type 'String}