max arity is not a constraint for account_type

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@18219 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/PropertySheet/Account.py

@@ -48,7 +48,6 @@ class Account:
       'description': 'Account Type must be set',
       'type': 'CategoryMembershipArity',
       'min_arity': 1,
-      'max_arity': 1,
       'portal_type': ('Category', ),
       'base_category' : ('account_type',),
       'condition' : 'python: object.getValidationState() not'