S.D. Codified Laws § 25-7A-8
If a person served with a notice of support debt under § 25-7A-5 contests paternity or custody of the child, and the person is presumed to be the parent of the child in accordance with the provisions of chapter 25-8, the secretary shall inform the responding party that an action must be commenced in circuit court in accordance with chapter 25-8 in order to establish that the person is not the father of the child or to establish custody. The notice of support debt, proof of service, and the response shall be filed for the purpose of establishing the support obligation as provided in § 25-7A-6. The establishment and enforcement of the obligation may not be stayed pending the action for paternity or custody determination commenced by the respondent.
SDCL 25-7A-8