Version 9
The code IND is used in 2 models:
<record id="ind" model="hc.vs.participation.type">
<field name="code">IND</field>
<record id="ind" model="hc.vs.identifier.type">
<field name="code">IND</field>
Each model has the SQL constraint
_sql_constraints = [
('code_unique',
'UNIQUE(code)',
"The concept code must be unique.")
]