Fix states of analytic account fields

Set the same state of the real one2many and use a custom one for required.

issue3012
review1151003

purchase.py

@@ -68,7 +68,9 @@ class PurchaseLine:
                 ['analytic_accounts'])['analytic_accounts']
 
         res.update(AnalyticAccount.analytic_accounts_fields_get(
-            analytic_accounts_field, fields_names))
+                analytic_accounts_field, fields_names,
+                states=cls.analytic_accounts.states,
+                required_states=Eval('type') == 'line'))
         return res
 
     @classmethod