// The following code can provide you a generic way to update a table when you only have the tableId.
public Common findRecord(TableId _tableId, RecId _recId, Boolean _forUpdate = false)
{
    Common      common;
    DictTable   dictTable;
    ;
    dictTable = new DictTable(_tableId);
    common = dictTable.makeRecord();
 
    common.selectForUpdate(_forUpdate);
 
    select common
    where common.RecId == _recId;
 
    return common;
}

// If you want, you can even update fields in this common record. You can Access/edit these fields by using their Name or FieldNum. The method below will update a specific field in a table.

public void updateValue(TableId _tableId, RecId _recId, str _field, AnyType _value)
{
    Common      common;
    Int         fieldId;
    ;
    ttsbegin;
    common = findRecord(_tableId, _recId, true);
    fieldId = fieldname2id(_tableId,_field);
 
    if (fieldId && _value)
    {
        common.(fieldId) = _value;
        common.update();
    }
    ttscommit;
}