odoo/addons/project_messages/security/ir.model.access.csv

1	id	name	model_id:id	group_id:id	perm_read	perm_write	perm_create	perm_unlink
2	access_project_messages	project.messages	model_project_messages	project.group_project_user	1	1	1	1
3	access_project_message_project_user	project.project.user	model_project_project	project.group_project_user	1	0	0	0