Index: lams_admin/src/java/org/lamsfoundation/lams/admin/web/controller/ExtServerManagementController.java
===================================================================
diff -u -r8c86b938e95d7e4081ddcba08a23012c813d936d -ra371801d3c9c3da48ba13bbf6fbfe9997dda5aeb
--- lams_admin/src/java/org/lamsfoundation/lams/admin/web/controller/ExtServerManagementController.java	(.../ExtServerManagementController.java)	(revision 8c86b938e95d7e4081ddcba08a23012c813d936d)
+++ lams_admin/src/java/org/lamsfoundation/lams/admin/web/controller/ExtServerManagementController.java	(.../ExtServerManagementController.java)	(revision a371801d3c9c3da48ba13bbf6fbfe9997dda5aeb)
@@ -127,21 +127,6 @@
 		    }
 		}
 	    }
-
-	    List<ExtServer> listPrefix = userManagementService.findByProperty(ExtServer.class, "prefix",
-		    extServerForm.getPrefix());
-	    if (listPrefix != null && listPrefix.size() > 0) {
-		if (sid.equals(0)) {//new map
-		    errorMap.add("prefix", messageService.getMessage("error.not.unique",
-			    new Object[] { messageService.getMessage("sysadmin.prefix") }));
-		} else {
-		    ExtServer map = listPrefix.get(0);
-		    if (!map.getSid().equals(sid)) {
-			errorMap.add("prefix", messageService.getMessage("error.not.unique",
-				new Object[] { messageService.getMessage("sysadmin.prefix") }));
-		    }
-		}
-	    }
 	}
 
 	if (errorMap.isEmpty()) {
Index: lams_common/src/java/org/lamsfoundation/lams/dbupdates/patch20230324.sql
===================================================================
diff -u
--- lams_common/src/java/org/lamsfoundation/lams/dbupdates/patch20230324.sql	(revision 0)
+++ lams_common/src/java/org/lamsfoundation/lams/dbupdates/patch20230324.sql	(revision a371801d3c9c3da48ba13bbf6fbfe9997dda5aeb)
@@ -0,0 +1,15 @@
+-- Turn off autocommit, so nothing is committed if there is an error
+SET AUTOCOMMIT = 0;
+SET FOREIGN_KEY_CHECKS=0;
+-- Put all sql statements below here
+
+-- LDEV-5277 Remove prefix uniqueness as sometimes duplicate feature becomes an useful feature
+
+ALTER TABLE lams_ext_server_org_map DROP KEY prefix;
+
+-- Put all sql statements above here
+
+-- If there were no errors, commit and restore autocommit to on
+COMMIT;
+SET AUTOCOMMIT = 1;
+SET FOREIGN_KEY_CHECKS=1;