radio button

a!gridLayout(
  labelPosition: "COLLAPSED",
  headerCells: {
    a!gridLayoutHeaderCell(
      label: cons!CR_APP_LAB_STAND_VS_NONSTANDARD_FIELDS[2]
    ),
    a!gridLayoutHeaderCell(
      label: cons!CR_APP_LAB_STAND_VS_NONSTANDARD_FIELDS[3],
      align: "CENTER"
    ),
    a!gridLayoutHeaderCell(
      label: cons!CR_APP_LAB_STAND_VS_NONSTANDARD_FIELDS[4],
      align: "CENTER"
    ),
    a!gridLayoutHeaderCell(
      label: cons!CR_APP_LAB_STAND_VS_NONSTANDARD_FIELDS[5]
    )
  },
  columnConfigs: {
    a!gridLayoutColumnConfig(weight: 5),
    a!gridLayoutColumnConfig(weight: "NARROW"),
    a!gridLayoutColumnConfig(weight: "NARROW"),
    a!gridLayoutColumnConfig(weight: 8)
  },
  rows: {
    a!forEach(
      items: ri!crAppStandVsNonStand_cdt,
      expression: a!localVariables(
        local!choiceValue,
        local!SingleREFStandardVsNonStand_cdt: index(
          ri!crRefStandVsNonStand_cdt,
          wherecontains(
            fv!item.questionId_int,
            tointeger(
              ri!crRefStandVsNonStand_cdt.questionId_int
            )
          ),
          {}
        ),
        a!gridRowLayout(
          contents: {
            a!textField(
              readOnly: true,
              value: fv!item.question_txt
            ),
            a!richTextDisplayField(
              align: "CENTER",
              value: a!richTextIcon(
                linkStyle: "STANDALONE",
                caption: rule!CR_APP_Guidelines_Mapping(
                  questions: trim(split(fv!item.question_txt, ".").[2])
                ),
                icon: "question-circle",
                color: "ACCENT"
              )
            ),
            a!radioButtonField(
              labelPosition: "COLLAPSED",
              choiceLayout: "COMPACT",
              disabled: ri!buttonAction_txt <> cons!CR_APP_TXT_STAND_VS_NONSTAND_EDIT,
              choiceLabels: cons!CR_APP_TXT_CHOICE_LABELS_YES_NO,
              choiceValues: touniformstring(cons!CR_APP_INT_CHOICE_VALUES),
              value: fv!item.answer_txt,
              saveInto: {
                fv!item.answer_txt,
                a!save(local!choiceValue, save!value),
                if(
                  isnull(fv!item.id_int),
                  {},
                  {
                    a!save(fv!item.updatedBy_txt, loggedInUser()),
                    a!save(fv!item.updatedOn_dt, now()),
                    a!save(
                      fv!item.updatedByRole_txt,
                      rule!CR_FN_getUserRole(inputUser_txt: loggedInUser())
                    )
                  }
                ),
                a!save(
                  ri!crAppStandVsNonStand_cdt,
                  a!forEach(
                    items: ri!crAppStandVsNonStand_cdt,
                    expression: if(
                      local!SingleREFStandardVsNonStand_cdt.dependentQuestion_int = fv!item.questionId_int,
                      rule!NBF_COMMON_updateDictionary(
                        dictionary: fv!item,
                        fieldsAndValues: {
                          answer_txt: if(
                            local!choiceValue = cons!CR_APP_INT_CHOICE_VALUES[1],
                            cons!CR_APP_INT_CHOICE_VALUES[2],
                            cons!CR_APP_INT_CHOICE_VALUES[1]
                          )
                        }
                      ),
                      fv!item
                    )
                  )
                )
              },
              required: index(
                local!SingleREFStandardVsNonStand_cdt,
                "required_int",
                {}
              )
            ),
            a!paragraphField(
              readOnly: ri!buttonAction_txt <> cons!CR_APP_TXT_STAND_VS_NONSTAND_EDIT,
              value: fv!item.comment_txt,
              saveInto: {
                fv!item.comment_txt,
                if(
                  isnull(fv!item.id_int),
                  {},
                  {
                    a!save(fv!item.updatedBy_txt, loggedInUser()),
                    a!save(fv!item.updatedOn_dt, now()),
                    a!save(
                      fv!item.updatedByRole_txt,
                      rule!CR_FN_getUserRole(inputUser_txt: loggedInUser())
                    )
                  }
                )
              },
              placeholder: if(
                like(
                  fv!item.question_txt,
                  "*" & cons!CR_APP_STANDARD_NONSTANDARD_TRANSACTIONS[7]
                ),
                cons!CR_TXT_PLACEHOLDER_VALUE[2],
                cons!CR_TXT_PLACEHOLDER_VALUE[1]
              ),
              required: fv!item.answer_txt,
              validations: rule!CR_FN_setMaximumCharactersValidation(comments_txt: fv!item.comment_txt)
            )
          }
        )
      )
    )
  },
  selectionSaveInto: {},
  validationGroup: "CHECKLIST",
  shadeAlternateRows: true
)

here in radio button for 17th and 18th question i have written like if we select 17 Q as yes then 18 wiill auto select to No and vise versa 

now i have to change the code if i select no for 17th Q if we select NO then 18th Q can be selected as NO along with the above code as well 

can anyone help me with this?