Siman 348
Presented here for study, not as a practical ruling. The Shulchan Aruch rules by Sephardi custom, the Rema's glosses by Ashkenazi custom, and the Kitzur follows Ashkenazi custom. For a practical question, ask your rabbi.
א הָיָה עוֹמֵד בִּרְשׁוּת הַיָּחִיד וְהוֹצִיא יָדוֹ מְלֵאָה פֵּרוֹת לִרְשׁוּת הָרַבִּים בְּתוֹךְ עֲשָׂרָה, בְּשׁוֹגֵג, מֻתָּר לְהַחְזִירָהּ לְאוֹתוֹ חָצֵר וְאָסוּר לְהוֹשִׁיטָהּ לְחָצֵר אַחֵר; וְאִם בְּמֵזִיד, אָסוּר אֲפִלּוּ לְהַחְזִירָהּ לְאוֹתוֹ חָצֵר. וְיֵשׁ אוֹמְרִים דְּהָנֵי מִלֵּי כְּשֶׁהוֹצִיא מִבְּעוֹד יוֹם, אֲבָל אִם הוֹצִיאָהּ מִשֶּׁחָשְׁכָה מֻתָּר לְהַחְזִירָהּ שֶׁמָּא יַשְׁלִיכֵם מִיָּדוֹ וְיָבֹא לִידֵי חִיּוּב חַטָּאת. בַּמֶּה דְּבָרִים אֲמוּרִים כְּשֶׁהוֹצִיאָהּ לִרְשׁוּת הָרַבִּים, אֲבָל אִם הוֹצִיאָהּ לְכַרְמְלִית בְּכָל גַּוְנָא מֻתָּר לְהַחְזִירָהּ.
1 One Who Extends Something from Domain to Domain: If someone was standing in the private domain, and he extended his hand full of fruit to the public domain less than ten tefachim from the ground; if he did it by mistake, he is permitted to return his hand to the original yard and is forbidden from extending his hand to another yard, but if he did it on purpose, he is forbidden even from returning it to the original yard. There are some who say that this refers to when he extended his hand on Friday while it was still daytime, but if he extended his hand once it was dark, he is permitted to return it, lest he drop some fruits and be liable for a sin offering. What specifically is being discussed? When he extends his hand to the public domain, but if he extends it to the karmelit, he is permitted to return it in every situation.