The SLIM VAT 3 package is accepted and means simpler invoicing, reduction of formalities, and improvement of financial liquidity for companies. Although it brings a large number of changes, from the perspective of fiscalization, we can say that it introduces simplifications in the field of reporting settlements regarding receipts (e.g., adapting the conditions for issuing invoices to e-receipts) and keeping sales records using cash registers (e.g., the possibility of waiving the obligation to print fiscal documents by taxpayers).
Source: fiscal-requirements.com