An ostracon from Trimithis in the Great Oasis recording quantities of oil, in keramia and choes, credited to named individuals, often with an additional amount 'for the surcharge'. One contributor is a deacon named Bekis.
In English machine translation
[side convex]
Petosiris son of Psenthes(?), 16 keramia
Samos son of Patchot, 18 keramia, and for the surcharge 1 keramion, and for the surcharge 1 keramion
Bekis son of Psais, 32 choes of oil, and for the surcharge
32 choes. Besis son of Horos, 15 choes and 2 choes
Psennesis also called Lykarion, 5 choes, and for the surcharge 1 chous
Petosiris son of Psenthotes, 20 choes, and for the surcharge
2 choes
[side concave]
Bekis the deacon, 15 choes, and for the surcharge
2 choes
Prosthēkē, here rendered 'surcharge', is an additional amount levied on top of the main payment. The 32 choes surcharge for Bekis equals his main amount, which may be a scribal slip.
Working translation of the DDbDP edition, made with Claude Opus 5.5 from the edition and the catalogue records shown below (catalogued as Account of oil). It has not been reviewed by a papyrologist: check the edition before citing. Restorations follow the edition; […] marks lost text and (?) an uncertain reading.