PHPMyAdmin 4.0.5 - Grid edit, checkbox, Edit, Copy and Delete features are not available

PHPMyAdmin 4.0.5 - Grid edit, checkbox, Edit, Copy and Delete features are
not available

I see this warning in PHPMyAdmin 4.0.5 "does not contain a unique column.
Grid edit, checkbox, Edit, Copy and Delete features are not available." In
PHPMyAdmin 3.5.1 these options appear correctly using the same database.
Can fix this? How? thanks in advance Fabián.