diff --git a/install/create_tables-innodb.sql b/install/create_tables-innodb.sql
index a1c84d598..1b0c031f0 100644
--- a/install/create_tables-innodb.sql
+++ b/install/create_tables-innodb.sql
@@ -362,6 +362,19 @@ CREATE TABLE `tblDocumentContentAttributes` (
 
 -- --------------------------------------------------------
 
+--
+-- Table structure for table `tblLinkType`
+--
+
+CREATE TABLE `tblLinkType` (
+  `id` int(11) NOT NULL AUTO_INCREMENT,
+  `name` text NOT NULL,
+  `color` char(8) DEFAULT NULL,
+  PRIMARY KEY (`id`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+
+-- --------------------------------------------------------
+
 --
 -- Table structure for table `tblDocumentLinks`
 --
@@ -372,13 +385,15 @@ CREATE TABLE `tblDocumentLinks` (
   `target` int(11) NOT NULL DEFAULT '0',
   `userID` int(11) NOT NULL DEFAULT '0',
   `public` tinyint(1) NOT NULL DEFAULT '0',
+  `linktype` int(11) NOT NULL DEFAULT '0',
   PRIMARY KEY (`id`),
   KEY `tblDocumentLinks_document` (`document`),
   KEY `tblDocumentLinks_target` (`target`),
   KEY `tblDocumentLinks_user` (`userID`),
   CONSTRAINT `tblDocumentLinks_document` FOREIGN KEY (`document`) REFERENCES `tblDocuments` (`id`) ON DELETE CASCADE,
   CONSTRAINT `tblDocumentLinks_target` FOREIGN KEY (`target`) REFERENCES `tblDocuments` (`id`) ON DELETE CASCADE,
-  CONSTRAINT `tblDocumentLinks_user` FOREIGN KEY (`userID`) REFERENCES `tblUsers` (`id`)
+  CONSTRAINT `tblDocumentLinks_user` FOREIGN KEY (`userID`) REFERENCES `tblUsers` (`id`),
+  CONSTRAINT `tblDocumentLinks_linktype` FOREIGN KEY (`linktype`) REFERENCES `tblLinkType` (`id`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
 
 -- --------------------------------------------------------
diff --git a/install/create_tables-postgres.sql b/install/create_tables-postgres.sql
index 0f5c96912..cad18e75c 100644
--- a/install/create_tables-postgres.sql
+++ b/install/create_tables-postgres.sql
@@ -305,6 +305,18 @@ CREATE TABLE "tblDocumentContentAttributes" (
 
 -- --------------------------------------------------------
 
+-- 
+-- Table structure for table "tblLinkType"
+-- 
+
+CREATE TABLE "tblLinkType" (
+  "id" SERIAL UNIQUE,
+  "name" text NOT NULL,
+  "color" char(8) DEFAULT NULL
+);
+
+-- --------------------------------------------------------
+
 -- 
 -- Table structure for table "tblDocumentLinks"
 -- 
@@ -314,7 +326,8 @@ CREATE TABLE "tblDocumentLinks" (
   "document" INTEGER NOT NULL default 0 REFERENCES "tblDocuments" ("id") ON DELETE CASCADE,
   "target" INTEGER NOT NULL default 0 REFERENCES "tblDocuments" ("id") ON DELETE CASCADE,
   "userID" INTEGER NOT NULL default 0 REFERENCES "tblUsers" ("id"),
-  "public" INTEGER NOT NULL default 0
+  "public" INTEGER NOT NULL default 0,
+  "linktype" INTEGER NOT NULL default 0 REFERENCES "tblLinkType" ("id")
 ) ;
 
 -- --------------------------------------------------------
diff --git a/install/create_tables-sqlite3.sql b/install/create_tables-sqlite3.sql
index 522fb025c..bde95fe9a 100644
--- a/install/create_tables-sqlite3.sql
+++ b/install/create_tables-sqlite3.sql
@@ -307,6 +307,18 @@ CREATE TABLE `tblDocumentContentAttributes` (
 
 -- --------------------------------------------------------
 
+--
+-- Table structure for table `tblLinkType`
+--
+
+CREATE TABLE `tblLinkType` (
+  `id` INTEGER PRIMARY KEY AUTOINCREMENT,
+  `name` text NOT NULL,
+  `color` char(8) DEFAULT NULL
+) ;
+
+-- --------------------------------------------------------
+
 --
 -- Table structure for table `tblDocumentLinks`
 --
@@ -316,7 +328,8 @@ CREATE TABLE `tblDocumentLinks` (
   `document` INTEGER NOT NULL default 0 REFERENCES `tblDocuments` (`id`) ON DELETE CASCADE,
   `target` INTEGER NOT NULL default 0 REFERENCES `tblDocuments` (`id`) ON DELETE CASCADE,
   `userID` INTEGER NOT NULL default 0 REFERENCES `tblUsers` (`id`),
-  `public` INTEGER NOT NULL default 0
+  `public` INTEGER NOT NULL default 0,
+  `linktype` INTEGER NOT NULL default 0 REFERENCES `tblLinkType` (`id`)
 ) ;
 
 -- --------------------------------------------------------
diff --git a/install/update-6.1.0/update-postgres.sql b/install/update-6.1.0/update-postgres.sql
index 916f13ab3..82bb34b19 100644
--- a/install/update-6.1.0/update-postgres.sql
+++ b/install/update-6.1.0/update-postgres.sql
@@ -64,7 +64,7 @@ CREATE TABLE "tblLinkType" (
   "color" char(8) DEFAULT NULL
 );
 
-ALTER TABLE "tblDocumentLinks" ADD COLUMN "linktype" INTEGER DEFAULT NULL REFERENCES tblLinkType("id") ON DELETE CASCADE;
+ALTER TABLE "tblDocumentLinks" ADD COLUMN "linktype" INTEGER DEFAULT NULL REFERENCES tblLinkType("id");
 
 UPDATE "tblVersion" set "major"=6, "minor"=1, "subminor"=0, "module"='core';
 
diff --git a/install/update-6.1.0/update-sqlite3.sql b/install/update-6.1.0/update-sqlite3.sql
index 9e0cc7baa..b096c2666 100644
--- a/install/update-6.1.0/update-sqlite3.sql
+++ b/install/update-6.1.0/update-sqlite3.sql
@@ -110,7 +110,7 @@ CREATE TABLE `tblLinkType` (
   `color` char(8) DEFAULT NULL
 );
 
-ALTER TABLE `tblDocumentLinks` ADD COLUMN `linktype` INTEGER DEFAULT NULL REFERENCES tblLinkType(`id`) ON DELETE CASCADE;
+ALTER TABLE `tblDocumentLinks` ADD COLUMN `linktype` INTEGER DEFAULT NULL REFERENCES tblLinkType(`id`);
 
 UPDATE `tblVersion` set `major`=6, `minor`=1, `subminor`=0, `module`='core';
 
diff --git a/install/update-6.1.0/update.sql b/install/update-6.1.0/update.sql
index 165d29741..c378150c3 100644
--- a/install/update-6.1.0/update.sql
+++ b/install/update-6.1.0/update.sql
@@ -74,7 +74,7 @@ CREATE TABLE `tblLinkType` (
   PRIMARY KEY (`id`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
 
-ALTER TABLE `tblDocumentLinks` ADD COLUMN `linktype` int(11) DEFAULT NULL, ADD FOREIGN KEY tblDocumentLinks_linktype(`linktype`) REFERENCES tblLinkType(`id`) ON DELETE CASCADE;
+ALTER TABLE `tblDocumentLinks` ADD COLUMN `linktype` int(11) DEFAULT NULL, ADD FOREIGN KEY tblDocumentLinks_linktype(`linktype`) REFERENCES tblLinkType(`id`);
 
 UPDATE `tblVersion` set `major`=6, `minor`=1, `subminor`=0, `module`='core';