Specifies the version of a trade or contract. This is used by systems or trading platforms in conjunction with TradeID <1003> to uniquely identify the version of a trade or contract. If used the conditions for a change of version are subject to bilateral agreement. It is recommended to change the version only for significant updates to the business entity rather than for minor changes to trade details or systematic distribution of reports. Examples where the version would change are trade quantity modification, customer account assignment or trade novation.