Fix - Use getTableForItemType() for custom dropdown search options to resolve correct shared table name (#1147)

* Fix - Use getTableForItemType() for custom dropdown search options to resolve correct shared table name

* Update CHANGELOG

Author: RomainLvr

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
+## [UNRELEASED]
+
+### Fixed
+
+- Fix SQL errors with custom dropdown fields
+
 ## [1.23.3] - 2026-02-12
 
 ### Added

inc/container.class.php

@@ -2217,8 +2217,10 @@ public static function getAddSearchOptions($itemtype, $containers_id = false)
                     $opt[$i]['datatype']   = 'specific';
                     $opt[$i]['searchtype'] = ['equals', 'notequals'];
                 } else {
-                    $opt[$i]['table']    = CommonDBTM::getTable($dropdown_matches['class']);
-                    $opt[$i]['field']    = 'name';
+                    $opt[$i]['table']    = getTableForItemType($dropdown_matches['class']);
+                    $opt[$i]['field']    = is_a($dropdown_matches['class'], CommonTreeDropdown::class, true)
+                        ? 'completename'
+                        : 'name';
                     $opt[$i]['right']    = 'all';
                     $opt[$i]['datatype'] = 'dropdown';