Every service SAP is associated, by default, with the appropriate service egress or ingress policy (policy-id 1). You can replace the default policy with a customer-configured policy, but you cannot entirely remove the policy from the SAP configuration. When you remove a non-default service egress or ingress policy, the association reverts to the default policy-id 1.
A QoS policy cannot be deleted until it is removed from all SAPs where it is applied.