Hi Srinath,
I knew my problem, because I used Vietnamese to write column tittle and uppercase word
Thank you so much.
Example:
Wrong
FIELDCATALOG-FIELDNAME = 'T_Haohut'.
FIELDCATALOG-SELTEXT_M = 'Hao hụt'.
FIELDCATALOG-OUTPUTLEN = 6.
FIELDCATALOG-INPUT = 'X'.
FIELDCATALOG-COL_POS = 17.
APPEND FIELDCATALOG.
CLEAR FIELDCATALOG.
True
FIELDCATALOG-FIELDNAME = 'T_HAOHUT'.
FIELDCATALOG-SELTEXT_M = 'SCRAP'.
FIELDCATALOG-OUTPUTLEN = 6.
FIELDCATALOG-INPUT = 'X'.
FIELDCATALOG-COL_POS = 17.
APPEND FIELDCATALOG.
CLEAR FIELDCATALOG.