EDIT limit of a column in ALV grid

I want to have an editable column in my ALV grid program.
i am using below code while creating field catalog.
gwa_fieldcat-tabname = text-02.                  "'GIT_BOM_REP'.
gwa_fieldcat-fieldname = COMMENT.                "'Comment'.
gwa_fieldcat-seltext_l = text-058.                "'Comment'.
gwa_fieldcat-edit = gc_x.
APPEND gwa_fieldcat TO git_fieldcat.
CLEAR gwa_fieldcat.
I am able to write in the output, but the problem is i can write only upto 10 characters.
Field length for this editable column is 200 and type is C.
Please suggest.
Thanks in Advance,
James.

Thanks for your reply.....
I am using this code also:
*Layout to set width.
gwa_layout-colwidth_optimize = gc_x.
gwa_layout-box_fieldname = 'BOX'.
gwa_layout-box_tabname = 'GIT_BOM_REP'.
GIT_BOM_REP-COMMENT length is 200 and typ is C.
this is the 20th column in my ALV report. and i am using REUSE_ALV_GRID_DISPLAY FM.
Regards,
James

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