# Regulation (EC) No 715/2009 of the European Parliament and of the Council of 13 July 2009 on conditions for access to the natural gas transmission networks and repealing Regulation (EC) No 1775/2005 (Text with EEA relevance), Division (2): Transmission system operators shall publish harmonised conditions under which capacity transactions (e.g. transfers and assignments) will be accepted by them. These conditions must at least include:

Extent: E+W+S+N.I.

(a)a description of standardised products which can be sold on the secondary market;
(b)lead time for the implementation/acceptation/registration of secondary trades. In case of delays the reasons have to be published;
(c)the notification to the transmission system operator by the seller or the third party as referred to under 3.4(1) about name of seller and buyer and capacity specifications as outlined in 3.4(1).
In so far such information is provided by a third party, transmission system operators shall be exempted from this provision.

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Source: https://www.legislation.gov.uk/eur/2009/715/annex/I/division/3/division/3.4/division/2 (the official version)
Page: https://openlegislation.uk/eu-regulation-2009-715/annex-I/division-3/division-3.4/division-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.