--- D:/_Webs/www.prevencionintegral.com_php55/public/includes/database/sqlsrv/schema - Copy.inc	Fri Nov 15 19:37:01 2013
+++ D:/_Webs/www.prevencionintegral.com_php55/public/includes/database/sqlsrv/schema.inc	Sat Nov 16 17:26:53 2013
@@ -120,15 +120,15 @@
 
     // If the table has no primary key, create one for us.
     // TODO: only necessary on Azure.
     if (isset($table['primary key']) && is_array($table['primary key'])) {
       $sql_fields[] = 'CONSTRAINT {' . $name . '}_pkey PRIMARY KEY CLUSTERED (' . implode(', ', $this->connection->quoteIdentifiers($table['primary key'])) . ')';
     }
     else {
-      $sql_fields[] = '__pk UNIQUEIDENTIFIER DEFAULT NEWID()';
+      $sql_fields[] = '__pk UNIQUEIDENTIFIER DEFAULT NEWID() NOT NULL';
       $sql_fields[] = 'CONSTRAINT {' . $name . '}_pkey_technical PRIMARY KEY CLUSTERED (__pk)';
     }
 
     $sql = "CREATE TABLE [{" . $name . "}] (\n\t";
     $sql .= implode(",\n\t", $sql_fields);
     $sql .= "\n)";
     return $sql;
@@ -344,14 +344,17 @@
   public function addField($table, $field, $spec, $new_keys = array()) {
     if (!$this->tableExists($table)) {
       throw new DatabaseSchemaObjectDoesNotExistException(t("Cannot add field %table.%field: table doesn't exist.", array('%field' => $field, '%table' => $table)));
     }
     if ($this->fieldExists($table, $field)) {
       throw new DatabaseSchemaObjectExistsException(t("Cannot add field %table.%field: field already exists.", array('%field' => $field, '%table' => $table)));
     }
+	
+	if ($spec['type'] == 'serial' && isset($spec['initial']))
+	  throw new Exception('Cannot add serial (IDENTITY) field with initial values');
 
     // If the field is declared NOT NULL, we have to first create it NULL insert
     // the initial data then switch to NOT NULL.
     if (!empty($spec['not null']) && !isset($spec['default'])) {
       $fixnull = TRUE;
       $spec['not null'] = FALSE;
     }
@@ -385,21 +388,28 @@
 
   /**
    * Override DatabaseSchema::changeField().
    *
    * @status complete
    */
   public function changeField($table, $field, $field_new, $spec, $new_keys = array()) {
+  
+
     if (!$this->fieldExists($table, $field)) {
       throw new DatabaseSchemaObjectDoesNotExistException(t("Cannot change the definition of field %table.%name: field doesn't exist.", array('%table' => $table, '%name' => $field)));
     }
     if (($field != $field_new) && $this->fieldExists($table, $field_new)) {
       throw new DatabaseSchemaObjectExistsException(t("Cannot rename field %table.%name to %name_new: target field already exists.", array('%table' => $table, '%name' => $field, '%name_new' => $field_new)));
     }
-
+	
+	// After deep research: IDENTITY columns cannot be updated. The closest it can get is to enable IDENTITY_INSERT
+	// But that will requiere to drop whole table and recreate it with new values
+	if($spec['type'] == 'serial')
+		throw new Exception(t('Cannot change field to serial TYPE (IDENTITY) on SQL SERVER'));
+	
     // SQL Server supports transactional DDL, so we can just start a transaction
     // here and pray for the best.
     $transaction = $this->connection->startTransaction();
 
     // Introspect the schema and save the current primary key if the column
     // we are modifying is part of it.
     $primary_key_sql = $this->introspectPrimaryKey($table, $field);
@@ -664,15 +674,15 @@
   }
 
   /**
    * Add a primary column to the table.
    */
   protected function createTechnicalPrimaryColumn($table) {
     if (!$this->fieldExists($table, '__pk')) {
-      $this->connection->query('ALTER TABLE {' . $table . '} ADD __pk UNIQUEIDENTIFIER DEFAULT NEWID()');
+      $this->connection->query('ALTER TABLE {' . $table . '} ADD __pk UNIQUEIDENTIFIER DEFAULT NEWID() NOT NULL');
     }
   }
 
   /**
    * Try to clean up the technical primary column if possible.
    */
   protected function cleanUpTechnicalPrimaryColumn($table) {