#1069 (continuation of commit 3558) There may be some null values in the Database, making it impossible to upgrade. Defining a default value is far enough for external keys and hierarchical keys. Furthermore, this will be less time consuming during the setup (no need for table scans)
#1069 (continuation of commit 3558) There may be some null values in the Database, making it impossible to upgrade. Defining a default value is far enough for external keys and hierarchical keys. Furthermore, this will be less time consuming during the setup (no need for table scans)

git-svn-id: 8a2b0a969c74f87a9c14cf35f460fb9b394f82c6@3569 a333f486-631f-4898-b8df-5754b55c2be0

changi67/itop,changi67/itop,changi67/itop,changi67/itop