Webservice TableData persmission

Hi all

My customer runs a webshop with integration to a NAV 2018.

When placing an order the webshop calls a webservice importing the weborder to NAV. This works fine.

Yesterday I made some code in the import using table 340 - Customer Discount Group. This morning my customer did not get any orders and the Eventviewer told me:

"MessageWithoutPrivateInformation: You do not have the following permissions on TableData Customer Discount Group: Read"

Yes i did restart the servicetier
Yes the user runing the servicetier is SUPER
Yes Table 340 is within the license.

Who or what is missing this permission and how do I set it up?

BR