There is no specific functionality to change the type of an attribute for a simple reason: it would be necessary to make an automatic correspondence between:
the source data (e.g., an ean-13 attribute localized in fr_FR and en_GB) and
the target data (e.g., an ean-13 attribute that cannot be translated).
The following is how you'd make this change:
From the Start an Export page, export all of your data for the type of document concerned via export. This will serve as a backup.
Documentation: https://docs.quable.com/v5-EN/docs/launch-an-export
In the Administration > Data Model menu, open the Attributes page.
Documentation: https://docs.quable.com/v5-EN/docs/objects-and-attributes
Delete the source attribute. At this moment, the attribute will no longer exist in the data model as well as any associated data.
Documentation: https://docs.quable.com/v5-EN/docs/objects-and-attributes#deleting-attributes
Create the new attribute.
Documentation: https://docs.quable.com/v5-EN/docs/objects-and-attributes#adding-attributes
Modify the previously exported file to keep only the mandatory columns to perform your operation. For example, the document_code and ean-13 column.
In the case of a change from a translatable attribute to a non-translatable attribute, your export must contain as many columns as there are locales (data languages), whereas the import will contain only one.)
Import the previously exported data.
Documentation: https://docs.quable.com/v5-EN/docs/start-an-import
Once the import is finished, everything is fine and your new attribute is created with a recovery/transformation of the existing data.
Obviously, since one attribute has been deleted and another created, you'll need to take into account:
Your users' access to the attributes
Your incoming and outgoing flows using this data