Date: 13 Shevat 5598
From: Rabbi Moshe Sofer
To: Rabbi Yaakov Ehrlich
A man forgot to sell his planted wheat to a non-Jew before Pesach, and the grain subsequently grew and produced a crop. The Chasam Sofer rules leniently, invoking a double doubt (safek sfeka).
Source: Shu"t Chasam Sofer OC §104