“executions” and “execution messages” phrases in FIX spec.

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Imported from previous forum

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My question concerns usage of “executions” and “execution messages” phrases in FIX specification.
Is “execution message” equivalent to “execution report” phrase ?
Is “execution” equivalent to “execution report with OrdStatus=FILLED or PARTIALLY FILLED” ?

Let’s look at the description of Account field in the execution report message:
“Required for executions against electronically submitted orders which were assigned an account by the institution or intermediary”.

Does “execution” mean in this sentence
“execution report”
or execution report with OrdStatus=FILLED or PARTIALLY FILLED
or … ?

And second example ExecId:
“Unique identifier of execution message as assigned by sell-side (broker, exchange, ECN) (will be 0 (zero) forExecType=I (Order Status)).”

Does “execution message” mean “execution report” here ?
Should ExecId be unique for every execution report ?

Janusz Szuba, TeleTrader