Tosefta על מעשרות 3:1

One who brings in figs from the field to eat them in a courtyard that is exempt from tithes (see Maasr. 3:5) -- [if] he forgot [to eat them in the courtyard] and he [instead] brought them inside his house, he may take them back out to the courtyard and eat casually from them.

One who brings in figs from the field to eat them in a courtyard that is exempt from tithes -- [if] he forgot and took them up to the top of the roof, even [if it is the roof] inside his house, he may eat from them casually. One who brings in figs from the field to them on top of his roof - [if] he forgot and brought them into his friend's courtyard -- he may not eat them until he has tithed. Rabbi Yosei bar Rabbi Yehuda says, he may take them on top of the roof and eat them [casually].