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ABL Data Types Addenda
Large object data types : Character large objects : Restrictions
 

Restrictions

The following restrictions apply to CLOB fields:
*The UNDEFINED code page is not allowed for CLOB values.
*You must copy a CLOB to a LONGCHAR in order to read or edit it.
*The size limit for a CLOB is 1 gigabyte.
*You cannot use CLOB values in an index.
*You cannot have an array of CLOB fields.
*You cannot pass a CLOB as a parameter (but you can pass a temp-table that contains a CLOB field as a parameter).
*CLOB fields are only allowed in temp-tables that are NO-UNDO.
*You cannot define a local program variable as a CLOB.
*You cannot use ASSIGN triggers for a CLOB field.
*You cannot use BUFFER-COMPARE on a CLOB field.
*The initial value for a CLOB must be the Unknown value (?).
*The RAW-TRANSFER statement skips CLOB fields, assigning the Unknown value (?) to the CLOB field in the target record.