Access Reference Document (ARD) : Should companies in the same Group prepare separate ARD or only one to represent the Group?

As stated in section 5.3.2 of the Commission Determination on Mandatory Standard on Access, Determination No. 2 of 2003 (MSA) each Access Provider (who own or provide network facilities or network services) on the Commission Determination of Access List, Determination No. 1 of 2001 (Access List)  must prepare and maintain an Access Reference Document.  

Thus, each licensed entity within the same Group that owns or provides network facilities or network services  under the Access List is required to prepare an ARD.