Open the Central Administration page for your site.

On the Quick Launch, click Application Management.

On the Application Management page, under Service Applications, click Manage service applications.

In the list of services, click your Business Data Connectivity (BDC) Service.

Click AWCustomers.

On the ribbon, click Set Object Permissions.

Enter the user accounts to which you want to grant permissions, and then click Add. For this example, you would add the security group that was created in Prerequisites for deploying a Business Connectivity Services on-premises solution in SharePoint 2013AdventureWorksBCSUsers.

Select the user accounts that you just added, and then select Execute check boxe.

Select the Propagate permissions to all BDC Models, External Systems and External Content Types in the BDC Metadata Store check box to overwrite existing permissions.

Click OK.