[EN] Since its discovery during the excavation of the royal palace of Ras Shamra-Ugarit, the tablet RS 15.010 has generated several studies and commentaries. This is chiefly related to the fact that it was the first bilingual with a text in Akkadian followed by a translation into Hurrian, a language that was scarcely known at that time and is still poorly understood today. Due to an exceptional combination of circumstances, no-one had ever noticed that this tablet, written in ideosyllabic cuneiform, also has on its reverse signs of an incomplete long Ugaritic abecedary. In this article we attempt to understand why this digraph has gone unnoticed. We also publish a photograph of the Ugaritic signs as they appear on the cast made of RS 15.010...