Definition:
The different characteristics (purchase/sale, work under contract, etc.) which are deemed to be useful in distinguishing one transaction from another.

Source:

• Regulation (EC) No 471/2009 of the European Parliament and of the Council of 6 May 2009 on Community statistics relating to external trade with non-member countries and repealing Council Regulation (EC) No 1172/95 Text with EEA relevance
  Place of publication: (Dz. Urz. UE L 152 z 16.06.2009, str. 23, z późn. zm.)
• Regulation (EC) No 638/2004 of the European Parliament and of the Council of 31 March 2004 on Community statistics relating to the trading of goods between Member States and repealing Council Regulation (EEC) No 3330/91
  Place of publication: (Dz. Urz. UE L 102 z 07.04.2004, str. 1, z późn. zm. – Dz. Urz. UE Polskie wydanie specjalne, rozdz. 2, t. 16, s. 64)