re: "cash trade"...nothing to do with cash or margin account-rather it pertains to a settlement modifier assigned to the trade when reported---it stands for "same day settlement"...
(B) Settlement Modifiers If a transaction is to be settled other than the regular way, report the settlement terms by selecting the appropriate modifier. If the parties agree to settlement on the same day the transaction is executed (i.e., cash settlement), select the modifier, ".c."
follow this past thread here forward for a bit more color...
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