Get the override e-mail address from the backend
select parameter_value from fnd_svc_comp_param_vals where parameter_id = ( select parameter_id from fnd_svc_comp_params_tl where display_name = 'Test Address' );
Set the override e-mail address from the backend
update fnd_svc_comp_param_vals set parameter_value = 'test@email.com' where parameter_id = ( select parameter_id from fnd_svc_comp_params_tl where display_name = 'Test Address' );