X_COLUMN_USAGE is a [fixed lexicon] with the following values:\\

%%zebra-table
||Saved Value||Displayed Value||Meaning
| OB | Obsolete             | The information is no longer used.
| PL | Pre-Loaded           | All supplied values will have this set
| UC | User Defined Column  | The user created and controls the information and it will not be overwritten when you receive a software update.  See [USER DEFINED COLUMN|USER DEFINED COLUMN (UDC)] for more information.
| UF | User Defined Formula | A read-only derived expression. See [USER_FORMULA_COLUMN] for usage and samples
%%