Hi,

The error you are encountering is because the Studio report is trying to evaluate a condition that involves multiple records. The name_field_tag == 8 condition is attempting to check if a single tag ID is equal to 8, but the expression is being evaluated for multiple tag records.

In Odoo Studio, when you apply a "Visible if" condition on a field based on a Many2many or One2many relationship, the condition is evaluated for each record in that relationship. If there are multiple records, the condition needs to be modified to handle that case.

Here's a potential solution:

1. Instead of using the == operator, use the in operator to check if the tag ID is present in the set of related records.
2. Use the mapped function to get a list of tag IDs from the related records.

The modified condition in the XML view should look like this:

{'invisible': [('name_field_tag', 'not in', [8])]}

This condition checks if the tag ID 8 is present in the list of tag IDs related to the record. If the tag ID 8 is not present, the field will be visible; otherwise, it will be invisible.

If you want to make the field invisible when any of the selected tags match a specific set of tag IDs, you can modify the condition as follows:

{'invisible': [('name_field_tag.ids', '&', [1, 8])]}

This condition checks if the set of tag IDs related to the record contains both 1 and 8. If both tag IDs are present, the field will be invisible; otherwise, it will be visible.

Or if you can done this using studio option try it in this way:

Hope it helps