I would like to get some hints about modeling a special type of orders to transfer money from and to a settlement account used to save customers money available for trading.
The customer has a portfolio of securities and a dedicated settlement account to provide the money to buy new securities.
So we have two types of orders: orders to buy or sell securities and orders to withdraw money from the settlement account (or vice versa).
I would like to user a FIX NewOrderSinge message but I am not sure which fields to use to indicate the different category of orders. Even another FIX message type may be suitable.
Any hints welcome !