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2215761 - Error ORA-22858 modifying column data type to CLOB - SAP PowerDesigner


  • Data type of an Oracle table column is modified to CLOB.
  • PowerDesigner generates an ALTER TABLE table_name MODIFY column_name statement.
  • Executing the script generated by PowerDesigner leads to error "ORA-22858 - invalid alteration of datatype".
  • The alter.sql file must drop then create the table again.

"Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental."



  • SAP PowerDesigner 16.5
  • Oracle DBMS


SAP PowerDesigner 16.5


table, Oracle, blob, clob, lob, drop, create, alter, change, CR789541, 789541 , KBA , BC-SYB-PD , PowerDesigner , Bug Filed

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