From: Rabbi Moshe Sofer
To: Rabbi Meir
The student challenges the Bahag's view that lighting Shabbos candles constitutes kabbalas Shabbos, asking why the Gemara's discussion of eruv timing ignores this. The Chasam Sofer resolves this by distinguishing between eruv (prohibited even b'dieved after lighting) and hatmanah (permitted b'dieved as a mere shevus), and rules that regionally problematic wine permitted for hefsed merubeh may be used for kiddush.
Source: Shu"t Chasam Sofer OC §65