Hi,
Its not possible to make TEXTVIEW as editable.
Instead, set the cell editor with input field of type CL_SALV_WD_UIE_INPUT_FIELD.
Here you can controll the READ_ONLY property of input field by using method SET_READ_ONLY.
You can achieve your requirement as below
data lr_input_field type ref to cl_salv_wd_uie_input_field.
CALL METHOD lv_value->if_salv_wd_column_settings~get_column
EXPORTING
id = 'ACTNT'
RECEIVING
value = lr_column.
" create object of type input field
CREATE OBJECT lr_input_field
EXPORTING
value_fieldname = 'ACTNT'.
lr_column->set_cell_editor( lr_input_field).
Hope this helps you.
Regards,
Rama