Issue: The "Data Mask" option appears under Advanced Properties, but the expected lefthandside input form as well as the two buttons are always hidden. This is caused by the css class: "o_invisible_modifier".
Note: it can still be used by removing this class and then typing and save or also via the direct DB access but seems not like the expected way.
Happy to create a PR if someone can help me to identify the cause as I am not really familiar with odoo addons.
Happy to create a PR if someone can help me to identify the cause as I am not really familiar with odoo addons.
Cheers :)