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title: ListID <66> field – FIX 4.0 – FIX Dictionary – Onix Solutions
description: ListID <66> field – FIX 4.0 – FIX Dictionary – Onix Solutions
---

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# ListID <66> field – FIX 4.0 – FIX Dictionary

| Messages by MsgType \| Messages by Name \| Fields by Tag \| Fields by Name \| FIX 4.0 \| Home FIX 4.0 : ListID <66> field Type: char Used In Description Customer assigned listUnique identifier for list as assigned by institution, used to associate multiple individual orders. Uniqueness must be guaranteed within a single trading day. Firms which generate multi-day orders should consider embedding a date within the ListID <66> field to assure uniqueness across days. Used In Execution Report <8> Order Cancel Reject <9> New Order - List <E> Order Cancel Request <F> Order Cancel/Replace Request <G> Allocation <J> List Cancel Request <K> List Execute <L> List Status Request <M> List Status <N> |
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