Legislation Primary legislation Primary legislation Law on companies no. 31/1990,/a> Law no 64/2008 Ordinance no. 22/2010 for the amendment and completion of Law no. 64/2008 Law no. 49/2019 for the amendment and completion of Law no. 64/2008 Decision no. 34/2012 on the approval of tariffs Secondary legislation Common technical requirements PT CR6-2013PT CR7-2013PT CR8-2009 IMSP technical prescriptions PT A1-2010PT C1-2010PT C2-2010PT C3-2012PT C4-2010PT C6-2010PT C7-2010PT C8-2010PT C9-2010PT C10-2010PT C11-2010PT C12-2003PT C5-2003 IR technical prescriptions PT R1-2010PT R2-2010PT R3-2010PT R7-2003PT R8-2003PT R8-2010PT R9-2003PT R10-2003PT R11-2003PT R12-2003PT R13-2003PT R15-2003PT R16-2003PT R17-2003PT R18-2003PT R19-2002