A binding decision means that both parties in a dispute are obligated to accept it. If a decision is non-binding, you can reject it and try other avenues, including, in some areas, small claims court.
Not mandatory; a non-binding dispute resolution procedure is one from which any disputant is free to walk away at any time; a non-binding decision in a case is one that any party may reject, opting instead to negotiate another settlement or to proceed to another type of dispute resolution procedure.
A document, like a DECLARATION, that carries no formal legal obligations. It may, however, carry moral obligations or attain the force of law as INTERNATIONAL CUSTOMARY LAW.