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Key Settle in Tradable refers to the settlement period of the referred Tradable.
If it is non-zero, then the referred Tradable is equivalent to a forward contract on the respective spot settling Tradable.
For example, if it equals
2D{WkEnd|N} and the referred Tradable is bought today, then legal and financial ownership is not realized immediatelly, but rather after 2 weekdays.
For most tradables, a small settlement period has no effect on their price, due to the fact their associated cash flows - such as dividends for tradables of type
Stock - occur generally at distant future times.
For tradables of type
Currency though, the settlement period is important, since a Currency does not pay interest income to its purchaser between transaction date and settlement date.
In the common case where a Currency is used as the reference Tradable in the price calculation of another Tradable, the Currency's settlement period will always have an effect on the calculated price.