List order (35=E) - why Tag 40 is not compulsory

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Imported from previous forum

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I do not understand why the tag 40 (Order type) is no more compulsory in FIX protocol 4.2 for message order list (35=E)?
It used to be in FIX protocol 4.1.

Could someone give me an example for which it should not be sent?

Thank you

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[ original email was from John Greenan - john.greenan@alignment-systems.com ]
Stephane,

In some cases a basket/program may be sent from a buy-side to a sell-side where the buy-side may not be interested in the details of the way the order is processed - they may only be interested in the fact that the overall order has been accepted.

As an example, if the basket has been ‘bid for’ the buy-side may not actually care how the order is handled, since the sell-side is taking on the risk of execution.

Get in touch off-line if you’d like to discuss this further.

Regards,

John

> I do not understand why the tag 40 (Order type) is no more compulsory in FIX protocol 4.2 for message order list (35=E)?
> It used to be in FIX protocol 4.1.
>
> Could someone give me an example for which it should not be sent?
>
> Thank you
>
>