Updating Ad customizer feed OperationAccessDenied.ACTION_NOT_PERMITTED

Hello! I'm using AdWords API (v201509) to manage my AdWords account. I want to update (SET operation) the price (FeedItemAttributeValue) in my Ad customizer feed data using the FeedItemService but i'm getting OperationAccessDenied.ACTION_NOT_PERMITTED@ class

Re: Updating Ad customizer feed OperationAccessDenied.ACTION_NOT_PERMITTED

Hello! I'm using AdWords API (v201509) to manage my AdWords account. I want to update (SET operation) the values (FeedItemAttributeValue) of my Ad customizer feed data using the FeedItemService but i'm getting OperationAccessDenied.ACTION_NOT_PERMITTED@ class

Updating Ad customizer feed

Hello! I'm using AdWords API (v201509) to manage my AdWords account. I want to update (SET operation) the values (FeedItemAttributeValue) of my Ad customizer feed using the FeedItemService but i'm having OperationAccessDenied.ACTION_NOT_PERMITTED error ! Should i use an another service ? --