how to achieve USUM1P=ECI data

how to achieve USUM1P=ECI series data, with prelim publish data and prelim publish date.


our economic data's logic is blur, user want to test market reaction when economic data publishes. But either cannot get the Latest data (for example, the latest data is of 13th September with no data), or cannot get the last publish date, which is 16th August.

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