AutoCAD Map 3D :: Change Settings Of A Constraint In SQLite?

I am not able to change a constraint in SQLite:

1. I created a schema  in SQLite witth AutoCAD Map 3D 2012.

2. I set a constraint to one field: a list with 3 entries valid for the property. For example:
       Test 1
       Test 2
       Test 3

3.    I draw some lines

In the schema editor I want to change the constraint:

-    But I am not able to add a new entry “Test 4” to the list from step 2

-    I am also not able to change an existing entries (“test 1” to “test 1 new”)

Is it possible to change the settings of a constraint?

The help [URL] says: “You cannot edit a schema to convert an existing field to use a different constraint type if the table already contains data. The table must be empty.” But I do not want to change the “constraint type”. I want to change the entries of the list.