Cannot alter a column in an index
| Item | Value | 
|---|---|
| SQLCode | -127 | 
| Constant | SQLE_COLUMN_IN_INDEX | 
| SQLState | 53W05 | 
| Sybase error code | 4939 | 
| ODBC State | S1000 | 
You may have attempted to delete or modify the definition of a column that is part of a primary or foreign key. You may have attempted to delete a column that has an index on it. In this case, DROP the index or key, perform the ALTER statement, and then add the index or key again.