http://drupal.org/project/unique_field
"performs additional validation when a node is created or updated by a user to require that a node's title, author, language, and CCK fields are unique within a given context."
Integration with Unique field would make editablefields much more effective & efficient for large-scale data input. As it would help ensure that information being inputted into fields is unique/ non-repetitive.
With both modules installed Unique field works correctly on node/edit page, but it doesn't validate when editing fields directly from nodes or views (through editablefields interface). Therefore editablefields allows you to input invalid (not validated) data into fields (that would not be accepted if submitted through node/edit form).
Editablefields should work with Unique field settings to display the validation error message inline on nodes and views using editable fields.
Comments
Comment #1
TimelessDomain commentedComment #2
andreiashu commentedComment #3
mengi commentedPer https://drupal.org/node/2148735, 6.x is longer maintained so issue is closed. If you wish to be a maintainer of the 6.x branch please create a new issue.