This hook loads on the admin dashboard.  It is fired immediately when clicking into an item to edit it, before the item details are rendered to the page.

/**
 * @param $item
 */
function my_custom_function( $item ) {
    // Use this hook to place a custom message or tool tip or anything else above the edit item fields in the item edit details
}

add_action( 'wpim_admin_pre_edit_item', 'my_custom_function' );