recurring.json in sk_api_schema-0.0.15

- old
+ new

@@ -42,10 +42,14 @@
     "payment_method":{
       "description": "How the invoce is beeing payed. Used in new payments.",
       "enum":["cash","bank_transfer","credit_card","paypal","direct_debit","cheque"],
       "type":"string"
     },
+    "external_ref":{
+      "description": "Some external reference, whatever this may be.",
+      "type":"string"
+    },
     "title":{
       "description": "The headline of a document. Use SK placeholders to prevent exessive typing e.g. 'Your recurring [number]'",
       "type":"string"
     },
     "notes_before":{
@@ -98,10 +102,9 @@
       "readonly":true,
       "type":"string"
     },
     "lock_version":{
       "description": "Auto-incremented to prevent concurrent updateing. First save wins and increments version. ",
-      "optional":true,
       "type":"integer"
     },
     "gross_total":{
       "description": "Gross total of all line items, 2 decimals places",
       "readonly":true,