The most important change is the legislator's indication of how to report aggregated documents. It is a departure from the previous rule, according to which invoices and documents should be recognized according to the date when the tax obligation arose. This was impossible to implement in the case of collective documents where tax obligations of individual transaction arose on different dates.
The amendment to the Regulation of the Minister of Finance, Investments, and Development of October 15, 2019, concerning the detailed scope of data contained in tax returns and records in the scope of tax on goods and services, introduced the solution that transactions recorded on the basis of collective documents should be recognized according to the date of the last event covered by the document.
The content of the amended regulations can be found here.