The practice of cassation over cassation and its consequent rule of precedent have resulted in a legal quagmire. The impact is evident in the pecuniary disposition of a bigamous marriage with far-reaching legal ramifications for a valid marriage in Ethiopia. In fact, the pecuniary consequences of a bigamous marriage have remained a perplexing challenge in Ethiopia due to, inter alia, the debatable precedential practice of the Federal Supreme Court. Given the constitutionally guaranteed regional autonomy of the regional states to regulate family matters in Ethiopia, the practice has constitutional implications for the application of the Oromia Family Code. This article argues that the federal doctrine of precedent and its enabling legislation not only lack a concrete constitutional basis, but also encroach upon the constitutional autonomy of regional states and the constitutional rights of legitimate spouses. Exploring the constitutional dimensions of the practice and its legal ramifications, the article suggests possible options to change the practice at a regional level.