diff --git a/product/ERP5/PropertySheet/Account.py b/product/ERP5/PropertySheet/Account.py
index 9e4c11916043a6bf1ff27e768bbb25d4ddc856eb..ae96b84711de786551edc088dd6c04c0f6f6565b 100644
--- a/product/ERP5/PropertySheet/Account.py
+++ b/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'