Hi,
Add below code in GET_P method:
method GET_P_CONC_LINES.
CASE iv_property.
WHEN if_bsp_wd_model_setter_getter=>fp_fieldtype.
rv_value = cl_bsp_dlc_view_descriptor=>FIELD_TYPE_TEXTAREA.
WHEN if_bsp_wd_model_setter_getter=>fp_textarea_rows.
rv_value = 12. " This will add 12 rows on web ui.Change as per your need
ENDCASE.
endmethod.
Regards
Anji