/SCMTMS/CL_FBI_GUIBB_TREE enhancement not working
i want to make a column of a tree to be read only. I extended the standard class /SCMTMS/CL_FBI_GUIBB_TREE by creating a subclass of this and then i redefine the GET_DEFINITION and GET_DATA methods by changing the READ_ONLY value to 'X' and also EV_FIELD_USAGE_CHANGED value to 'X'.
Then i assign this custom class as a feeder class in my fpm application.
But in the end, the column is still a editable column.
May i know what steps did i missed?