[FIX] exp_official_mission: write new records with the new sequence

odex25_hr/exp_official_mission/models/hr_official_mission.py

@@ -138,7 +138,7 @@ class HrOfficialMission(models.Model):
         new_record = super(HrOfficialMission, self).create(vals)
         if new_record.process_type == 'mission':
             seq = self.env['ir.sequence'].next_by_code('hr.official.mission') or '/'
-            vals['reference'] = seq
+            new_record.write({'reference': seq})
         return new_record
 
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