Default value in Doctrine

Database default values are not "portably" supported. The only way to use database default values is through the columnDefinition mapping attribute where you specify the SQL snippet (DEFAULT cause inclusive) for the column the field is mapped to.

You can use:

<?php
/**
 * @Entity
 */
class myEntity {
    /**
     * @var string
     *
     * @Column(name="myColumn", type="string", length="50")
     */
    private $myColumn = 'myDefaultValue';
    ...
}

PHP-level default values are preferred as these are also properly available on newly created and persisted objects (Doctrine will not go back to the database after persisting a new object to get the default values).

Try to:

1. Clear any cache that may contain the config or PHP code.
2. Rename a field in case the first solution didn't work.

You should add schema name for that function:

CREATE TABLE [dbo].[Clients](
   [ModifyingUser] [nvarchar](128) NOT NULL DEFAULT dbo.sCurrentAppUser (),
   [Modification] [char](1) NULL DEFAULT 'A',
   [ModifyingHost] [nvarchar](128) NOT NULL DEFAULT host_name (),
   [ClientID] [uniqueidentifier] NOT NULL,
   [Label] [nvarchar](1024) NULL,
   CONSTRAINT [PK_Clients] PRIMARY KEY (
      [ClientID] ASC
   )
)