How to add a group to project module properly?

I'm trying to add a third group (in addition to User and Manager) to project app using xml.Accountant The group is greated just fine, but in the users group view (Settings->Users->Users->Access Rights->Applications) the selection field for project app is gone... I have also addes access right for this group using ir.model.access.csv access_project_project_accountant,project.project accountant,model_project_project,project.group_project_accountant,1,0,0,0 What am I missing / getting wrong?