On Transact SQL language the Msg 243 Level 16 - Is not a defined system type means that the date type is misspelled or does not exist.
Msg 243 Level 16 Example:
Invalid select:
SELECT CONVERT (time123, GETDATE()) as System_time,
CONVERT (datetime2, GETDATE()) as System_datetime2;
| Message |
|---|
| Msg 243, Level 16, State 1, Line 1 |
| Type time123 is not a defined system type. |
Correct select:
SELECT CONVERT (time, GETDATE()) as System_time,
CONVERT (datetime2, GETDATE()) as System_datetime2;
| System_time | System_datetime2 |
|---|---|
| 15:55:19.7800000 | 2014-09-06 15:55:19.7800000 |
Other error messages:
- Conversion failed when converting date and/or time from character string
- Conversion failed when converting the varchar value
- Unknown object type used in a CREATE, DROP, or ALTER statement
- Cannot insert the value NULL into column
- Cannot insert explicit value for identity column in table
- The INSERT statement conflicted with the FOREIGN KEY constraint
- The DELETE statement conflicted with the REFERENCE constraint