You can set the ILB Gain Loss Flag (tag 3856) option at the entity/accounting basis level to determine whether ILB (inflation linked bond) gain/loss at maturity is booked to income or gain/loss. You can also set the No Negative Income Flag (tag 3857) option to allow no negative income at the entity/basis level for Identified Cost portfolios. That option applies to ILBs as well as to other types of debt securities. For general information about setting up entities and accounting bases, see Create/Edit Entity Panel Options and Add a Basis to a Portfolio Panel Options for Entities.
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