Spatial column '%1' can not be included in a primary key or unique index

Error constant SQLE_SLERR_CREATE_INDEX_UNIQUE
ODBC 2 state ERROR
ODBC 3 state ERROR
Parameter 1 The name of the spatial column.
Severity 16
SQLCODE -1453
SQLSTATE 2FW46
Sybase error code 13119
 Probable cause