In the DDI character builder, when building a half-elf character you can select the Elven Arcane Precision feat. This is an enhancement of the Elven Accuracy racial power. But the resulting character sheet does not feature Elven Accuracy itself as a power.
Where is the error? Do half-elves have the Elven Accuracy power (ie. the error is in omitting it from the character sheet)? Or do they not (ie. the error is in allowing the selection of Elven Arcane Precision in the first place)?