Hello, In 4-2, – In case of post-trade, take a look inside (fpml-posttrade.xsd) Novation -> NovationDetails.model (it extends Event base class) – In case of execution advice, take a look inside (fpml-contract-novation.xsd) ContractNovated -> ContractNovationDetails.model Example: msg_ex26_alleged_novation.xml FpML-5-2: confirmationStatus/allegedEvent/novation/transferor/ confirmationStatus/allegedEvent/novation/transferee/ Corresponds to FpML-4-2: /FpML/novation/transferor/ /FpML/novation/transferee/ Note: in above example, FpML of type “NovationAlleged” You can find a spreadsheet with message mapping here – http://www.fpml.org/documents/groupdocs.html [February 02, 2012: Messaging Mapping Table between Version 4.9 and 5.3 excel ] Regards, Irina Yermakova