How to specify internally crossed trade (interfund) using FIXML 4.4

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Imported from previous forum

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[ original email was from Mark Sipos - mark@tepin.com ]
Hi,
We’re building a 4.4 FIXML interface between the buy side front and back offices. One of the questions that has come up is how to express an internally crossed trade (aka interfund trade) where one portfolio sells a security and the other buys it. If there is an accepted way of doing this we would like to follow along. We’re keen on what the Allocation Instruction should look like, in particular tags 54 (Side), and the Parties Component.

Regards,

Mark Sipos
Tepin Information LLC