MultilegOrderCancelReplace

FIX Message MultilegOrderCancelReplace (MsgType=AC)

MsgType	FIX Specification	First introduced
MsgType=AC	Trade messages - MultilegOrders	FIX.4.3

Used to modify a multileg order previously submitted using the New Order - Multileg message. See Order Cancel Replace Request for details concerning message usage.

Message Contents By FIX Version

• FIX.4.3
• FIX.4.4
• FIX.5.0
• FIX.5.0SP1
• FIX.5.0SP1+
• FIX.5.0SP2+

Notes

Please post comments, clarifications, examples here. Click on the edit button on the right and away you go! 

Don't forget to refer to the FPL Discussion Groups to back up anything you write.
You will often find the authoritative statements on matters of FIX specification interpretation there.
Links from FIXwiki pages to relevant discussions on the FPL site are very valuable.

For example if you were writing a clarification on how to specify the "quantity" of an order in FIX, you might add the
following relevant link, http://www.fixprotocol.org/discuss/read/f5014573, to back up your points.