Form level validation is not triggering on Submit - 2part

I have the same problem like

"This validation is working fine when I am testing the interface. But when the interface is integrated to the process, validation doesn't trigger and form gets submitted without executing the validation.
Is there anything else that I should configure to make sure that validation gets executed before the submission of form?"  https://community.appian.com/discussions/f/user-interface/8783/form-level-validation-is-not-triggering-on-submit

load(
  local!isCustomer: true,
  local!customerDetails,
  local!showSearchResults,
  local!selectedCustomer,
  local!errorMessage,
  with(
    a!formLayout(
      label: "Test",
      validationGroup: "main",
      validations: if(
        rule!IsNotNullOrEmpty(
          local!errorMessage
        ),
        local!errorMessage,
        null
      ),
      contents: {
            a!radioButtonField(
              choiceLayout: "COMPACT",
              choiceLabels: {
                "Customer",
                "Non-Customer"
              },
              choiceValues: {
                true,
                false
              },
              value: local!isCustomer,
              saveInto: {
                local!isCustomer,
                a!save(
                  ri!bpCustomer,
                  null
                )
              }
            ),
            if(
              local!isCustomer,
              {
                a!sectionLayout(
                  contents: rule!BAE_SectionSearchCustomer(
                    showSearchResults: local!showSearchResults,
                    selectedCustomer: local!selectedCustomer
                  )
                ),
                a!buttonLayout(
                  primaryButtons: {
                    a!buttonWidgetSubmit(
                      label: "Next",
                      value: true,
                      skipValidation: false,
                      saveInto: {
                        a!save(
                          local!customerDetails,
                          rule!GetCustomerById(
                            local!selectedCustomer.CustomerID
                          )
                        ),
                        if(
                          rule!IsNotNullOrEmpty(
                            local!customerDetails
                          ),
                          {
                            a!save(
                              ri!bpCustomer,
                              ............
                              )
                            ),
                            a!save(
                              local!errorMessage,
                              null
                            )
                          },
                          a!save(
                            local!errorMessage,
                            "Something went wrong, unable to retrieve additional customer data, please try again"
                          )
                        ),
                        a!save(
                          ri!auditHistory,
                          append(
                            ri!auditHistory,
                            'type!{urn:com:appian:types:BP}BP_AuditHistory'(
                              user: loggedInUser(),
                              step: "Select Customer",
                              action: "NEXT",
                              comment: "Existing Customer",
                              timestamp: now()
                            )
                          )
                        )
                      },
                      validationGroup: "main",
                      disabled: rule!IsNullOrEmpty(
                        local!selectedCustomer
                      )
                    )
                  },
                  secondaryButtons: {
                    a!buttonWidgetSubmit(
                      label: "Cancel",
                      skipValidation: true,
                      value: true,
                      saveInto: {
                      }
                    )
                  }
                )
              },
              {
                a!sectionLayout(
                  label: "",
                  contents: {
                    a!textField(
                      value: "Then let's continue",
                      readonly: true
                    ),
                    a!buttonLayout(
                      a!buttonWidgetSubmit(
                        label: "Next",
                        value: true,
                        skipValidation: true,
                        saveInto: {
                        }
                      )
                    )
                  }
                )
              }
            )
      }
    )
  )
)

I have a form which has a form level validation which is configured to execute on Submit, using validationGroup . Attached the code. Maybe, somebody will find a mistake.

 

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