64ac1400e1
The attributes of fields of list views do not mention the `optional`
attribute while it is used by chapter 12 of the R&D Training.
This commit describes this `optional` attribute.
task-3380953
closes odoo/documentation#4900
X-original-commit:
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| .. | ||
| data | ||
| orm | ||
| performance | ||
| standard_modules | ||
| testing | ||
| actions.rst | ||
| data.rst | ||
| http.rst | ||
| mixins.rst | ||
| module.rst | ||
| orm.rst | ||
| performance.rst | ||
| reports.rst | ||
| security.rst | ||
| standard_modules.rst | ||
| testing.rst | ||
| views.rst | ||