VAT payer data table row limit: 99 rows per table, unlimited tables per period.

• There is a limit of 99 rows in the electronic form J/F13123 “Table of taxpayer data on VAT”.
• There is no limit on the number of Tables that a taxpayer can submit to the State Tax Service in one period.
• The Table is submitted by the taxpayer in electronic form using technical means of electronic communication.
• The Table must comply with the requirements of the Laws of Ukraine “On Electronic Identification and Electronic Trust Services”, “On Electronic Documents and Electronic Document Management” and the Order on the exchange of electronic documents with controlling bodies.

Source: news.dtkt.ua

Note that this post was (partially) written with the help of AI. It is always useful to review the original source material, and where needed to obtain (local) advice from a specialist.