Apply read only mode for the newly added child row

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How to set read-only specific child tables row?

Hello, I need to set read-only specific row in child table. In the figure below, I can make the fields in the whole table read-only. But i must set read-only specific fields in rows cur_frm.fields_dict.xxxx_table.grid.fields_map.xxxx.read_only = true; Thanks for helps.