How to use Security Definition for set of Equities

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Imported from previous forum

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We need to use a Security Definition to return a list of Securities (usage #5)—in this case simple Equities.

Is it correct to:
– use the repeated ‘Underlying*’ fields (including #311 UnderlyingSymbol) for each Equity.
– leave the top-level fields (including #55 Symbol) blank
– set #323 SecurityResponseType = 4
?

Thanks
Roy MacLean
OM Technology