Tennessee Code Title 36. Domestic Relations § 36-7-205

An agreement or power of attorney under this part must be filed within a reasonable time with any court that has entered an order on custodial responsibility or child support that is in effect concerning the child who is the subject of the agreement or power of attorney and shall be binding upon the parties upon approval by the court. The case number and heading of the pending case concerning custodial responsibility or child support must be provided to the court with the agreement or power of attorney.