Reference for Bava Metzia 147:7

תנן פוסק עמו על הגדיש והא מחוסר משדא בחמה למיבש ולמידש ומידרא כגון דשדא בחמה ויבש

And the law is that [it gives possession only] in respect of submission to the curse. But where it is the usage that this gives actual possession, it does so [with full legal recognition].<span class="x" onmousemove="('comment',' I.e., a method of acquisition based on local usage receives full legal recognition. ');">⁶</span>

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