Hi , 

You need to give access rights to the menu and model

Eg:

<menuitem id="menu_element_variable" action="action_element_variable" parent="hr_work_entry_contract.menu_hr_payroll_configuration" groups="base.group_user" sequence="10"/>

and add the security in the ir.model.access.csv file as follows

access_name,security_name,model_name,base.group_user,1,1,1,1 

Regards