France has questioned the need for safeguards designed to stop potential abuse of CRSs.
The safeguards are written into the EC's proposed revision of the Code of Conduct for CRSs in Europe now being discussed in Brussels.
The safeguards aim to stop anti-competitive practices by airlines which are designated "parent carriers" – those which own or control a CRS.
At the meeting of the Council of Ministers' aviation working party in Brussels on January 21, France questioned whether there was any need for two of the safeguard clauses in the proposed revised Code.
Denmark, the UK, Poland and Sweden all argued at the meeting that the clauses were needed.
The clauses France queried were aimed at preventing a parent carrier refusing to place its inventory on a rival CRS and being obliged only to accept bookings which conform to its own fares and conditions; that any fees payable to a CRS should be the same for all airlines.
Air France, Lufthansa and Iberia have between them a stake of nearly 46% in Amadeus, the largest CRS in Europe.
But the EC said, when it published its proposed revision of the Code of Conduct last year, it does not regard them as parent carriers of Amadeus.
The Council's aviation working party met again in Brussels on Tuesday (February 5) and a spokeswoman said work on the Code was "progressing."
The Party's revised code is expected to be on the agenda when EC Transport Ministers meet in April.
The revised code will also have to go before the European Parliament before it is put into practice.
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