CashMargin <544> field – FIX 5.0 SP2 – FIX Dictionary
Identifies whether an order is a margin order or a non-margin order. This is primarily used when sending orders to Japanese exchanges to indicate sell margin or buy to cover. The same tag could be assigned also by buy-side to indicate the intent to sell or buy margin and the sell-side to accept or reject (base on some validation criteria) the margin request.
1 = Cash
2 = Margin Open
3 = Margin Close