Beginning with the financial year of 2020, all companies listed on EU regulated markets are required to prepare their annual financial reports in ESEF. The European Securities and Markets Authority commonly referred to as ESMA, has put forth a list of ESEF reporting requirements which each report must live up to in order to be compliant.
In 2013 the Transparency Directive was amended to include the requirement that issuers prepare their annual financial reports in one electronic reporting format. ESMA was tasked with developing the regulatory technical standards (RTS) specifying the format. What they came up with was ESEF, or the European Single Electronic Format, which is an iXBRL format. You can learn more about ESEF reporting here.
The detailed provisions of the European Single Electronic Format (ESEF) are contained within the Reporting Technical Standards (RTS) on ESEF which are included in the Final Report on the RTS on ESEF.
ESMA has created the ESEF Reporting Manual to present companies with guidance on how to adhere to the ESEF requirements as well as outline common issues related to creating iXBRL documents.
The manual was originally published in December 2017, but it has since been updated in July 2019 and July 2020.
It is expected that ESMA will further update the ESEF Reporting Manual as they have stated that they will continually monitor developments in the market and gather feedback from key stakeholders, so they can provide further guidance.