In its turn, Law No. 33/2012 specifies three stages for the formation of electoral bureaus for European elections:

Stage 1: One representative from each political party, organisation of citizens belonging to national minorities, or political/electoral alliance that participates in the elections and has members in the European Parliament.
Stage 2: One representative from each political party, organisation of citizens belonging to national minorities, or political/electoral alliance that participates in the elections but has no members in the European Parliament.
Stage 3: If a political organisation in Stage 1 or 2 is entitled to a representative but has not submitted one, the next organisation in line (from Stage 1 or 2) that has submitted a representative will be allocated the position.