After the underlying pools become available for allocation of an open Long TBA position, you can use the Allocate TBA Buy panel in the Book Trade tool to perform the allocation task. For detailed information, see Book Trades for TBAs.
You must identify the TBA lot that you want to allocate in the panel and then can enter the subsequent pools in the pane at the bottom of the panel. Eagle Accounting shares the Trade Date, Settlement Date, and open unit Price of the TBA transaction with the underlying pools, so you need only input the unique fields for the underlying pool.
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