The Item Similarity menu allows the Item Bank Manager to make use of the semi-automated Enemy Detection feature built into the application to specify Item Enemy associations. This feature calculates and proposes pairs of items between which Enemy association can be established. The Item Bank Manager then selects the pairs of items to which he/she confirms the Enemy association.
As you can see in the above screenshot, there is no Item Comparison Criteria set by default. The Item Bank Manager must set this criteria by clicking the Set Criteria button as described in Item Similarity Criteria Configuration. The Enemy association between item pairs is decided later as detailed in Retrieve Item Pairs to Decide Enemy Relationships by Item Bank Manager or in the Item Similarity tab by the Project Manager.