BMXAA8299EThere must be a key attribute set for the type-ahead configuration. The key attribute is the type-ahead choice that is displayed as the user types data in the field. The key attribute is based on information available in the server. Select the key attribute.
Explanation
The Type Ahead configuration needs a key attribute so that it knows what attribute from the Type Ahead list should be set on the field it is configured for. There can only be one key attribute.