Settlement Instruction Clarificiation

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Imported from previous forum

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Hello,

I’m already using Fixml 4.2 standard for message Order and ExecutionReport and OrderCancelRequest;
Now I would like to begin to use Settlement Instruction message but I have some doubt on what is the meaning of SettlInstMode or better the differences between Standing Instructions, Specific Allocation Account Overriding, Specific Allocation Account Standing and default;

Can somebody clarify my doubt?

Thanks Matteo