Concat() field not working Editable Grid

Hi! I have an editable grid in which the user can add new rows. I have a problem with the field "Clave Única". Its value is the concat() function of other two fields of each row

1) It appears correctly written in the editable grid 

2) It seems not to be flowing correctly to my local variable

What can I do to fix this? Is my code wrong?

My code is below (line 60 is where I configure the value and saveInto for the field):

a!localVariables(
  local!LineasPedido: {},
  {
    a!sectionLayout(
      label: "Líneas Pedido",
      labelIcon: "list-alt-solid",
      contents: {
        a!gridLayout(
          label: "A continuación, incorpore las líneas de pedido correspondientes y pulse el botón de creación",
          headerCells: {
            a!gridLayoutHeaderCell(label: "Linea Pedido"),
            a!gridLayoutHeaderCell(label: "Pedido"),
            a!gridLayoutHeaderCell(label: "Proveedor"),
            a!gridLayoutHeaderCell(label: "Material"),
            a!gridLayoutHeaderCell(label: "Clave Única"),
            a!gridLayoutHeaderCell(label: "Cantidad"),
            a!gridLayoutHeaderCell(label: "Precio Unitario"),
            a!gridLayoutHeaderCell(label: "Importe Total"),
            a!gridLayoutHeaderCell()
          },
          columnConfigs: {
            a!gridLayoutColumnConfig(width: "DISTRIBUTE"),
            a!gridLayoutColumnConfig(width: "DISTRIBUTE"),
            a!gridLayoutColumnConfig(width: "DISTRIBUTE"),
            a!gridLayoutColumnConfig(width: "DISTRIBUTE"),
            a!gridLayoutColumnConfig(width: "DISTRIBUTE"),
            a!gridLayoutColumnConfig(width: "DISTRIBUTE"),
            a!gridLayoutColumnConfig(width: "DISTRIBUTE"),
            a!gridLayoutColumnConfig(width: "DISTRIBUTE"),
            a!gridLayoutColumnConfig(width: "ICON")
          },
          rows: a!forEach(
            items: local!LineasPedido,
            expression: a!gridRowLayout(
              contents: {
                a!textField(
                  value: fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{fcfa4b36-4398-4430-8055-ecfa59daf13a}idLineaPedido'],
                  saveInto: {
                    fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{fcfa4b36-4398-4430-8055-ecfa59daf13a}idLineaPedido']
                  }
                ),
                a!textField(
                  value: fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{71427dbb-12db-4f83-bd99-f625bf9af271}idPedido'],
                  saveInto: {
                    fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{71427dbb-12db-4f83-bd99-f625bf9af271}idPedido']
                  }
                ),
                a!textField(
                  value: fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{464f0883-d6d5-4c58-b054-4de8e9e99902}Proveedor'],
                  saveInto: {
                    fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{464f0883-d6d5-4c58-b054-4de8e9e99902}Proveedor']
                  }
                ),
                a!textField(
                  value: fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{69e9a834-b2fb-4f35-a36d-3c526c97f4ac}Material'],
                  saveInto: {
                    fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{69e9a834-b2fb-4f35-a36d-3c526c97f4ac}Material']
                  }
                ),
                a!textField(
                  value: concat(
                    fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{71427dbb-12db-4f83-bd99-f625bf9af271}idPedido'],
                    "-",
                    fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{69e9a834-b2fb-4f35-a36d-3c526c97f4ac}Material']
                  ),
                  saveInto: {
                    fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{caf81eeb-f499-4adc-b078-f2692f6e38b2}ConcatPedidoMaterial']
                  }
                ),
                a!integerField(
                  value: fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{e78c5b35-026f-4713-8404-05077c6c9152}Cantidad'],
                  saveInto: {
                    fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{e78c5b35-026f-4713-8404-05077c6c9152}Cantidad'],
                    a!save(
                      fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{beb59a89-a332-46d3-b718-a8285f58f942}Importe'],
                      if(
                        or(
                          isnull(
                            fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{e78c5b35-026f-4713-8404-05077c6c9152}Cantidad']
                          ),
                          isnull(
                            fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{47f4bf32-2e41-4c5a-a7e7-9fc7786bd753}PrecioUnit']
                          )
                        ),
                        0,
                        fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{e78c5b35-026f-4713-8404-05077c6c9152}Cantidad'] * fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{47f4bf32-2e41-4c5a-a7e7-9fc7786bd753}PrecioUnit']
                      )
                    )
                  },
                  required: true,
                  validations: {
                    if(
                      a!isNotNullOrEmpty(
                        fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{e78c5b35-026f-4713-8404-05077c6c9152}Cantidad']
                      ) = false,
                      "",
                      if(
                        fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{e78c5b35-026f-4713-8404-05077c6c9152}Cantidad'] < 1,
                        "La cantidad debe ser superior a cero",
                        ""
                      )
                    )
                  }
                ),
                a!floatingPointField(
                  value: fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{47f4bf32-2e41-4c5a-a7e7-9fc7786bd753}PrecioUnit'],
                  saveInto: {
                    fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{47f4bf32-2e41-4c5a-a7e7-9fc7786bd753}PrecioUnit'],
                    a!save(
                      fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{beb59a89-a332-46d3-b718-a8285f58f942}Importe'],
                      if(
                        or(
                          isnull(
                            fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{e78c5b35-026f-4713-8404-05077c6c9152}Cantidad']
                          ),
                          isnull(
                            fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{47f4bf32-2e41-4c5a-a7e7-9fc7786bd753}PrecioUnit']
                          )
                        ),
                        0,
                        fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{e78c5b35-026f-4713-8404-05077c6c9152}Cantidad'] * fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{47f4bf32-2e41-4c5a-a7e7-9fc7786bd753}PrecioUnit']
                      )
                    )
                  },
                  required: true,
                  validations: {
                    if(
                      a!isNotNullOrEmpty(
                        fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{47f4bf32-2e41-4c5a-a7e7-9fc7786bd753}PrecioUnit']
                      ) = false,
                      "",
                      if(
                        fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{47f4bf32-2e41-4c5a-a7e7-9fc7786bd753}PrecioUnit'] < 0,
                        "El precio unitario debe ser superior a cero",
                        ""
                      )
                    )
                  }
                ),
                a!floatingPointField(
                  value: if(
                    or(
                      isnull(
                        fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{e78c5b35-026f-4713-8404-05077c6c9152}Cantidad']
                      ),
                      isnull(
                        fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{47f4bf32-2e41-4c5a-a7e7-9fc7786bd753}PrecioUnit']
                      )
                    ),
                    0,
                    fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{e78c5b35-026f-4713-8404-05077c6c9152}Cantidad'] * fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{47f4bf32-2e41-4c5a-a7e7-9fc7786bd753}PrecioUnit']
                  ),
                  saveInto: {
                    fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{beb59a89-a332-46d3-b718-a8285f58f942}Importe']
                  },
                  required: true,
                  validations: {
                    if(
                      a!isNotNullOrEmpty(
                        fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{beb59a89-a332-46d3-b718-a8285f58f942}Importe']
                      ) = false,
                      "",
                      if(
                        fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{beb59a89-a332-46d3-b718-a8285f58f942}Importe'] < 0,
                        "El importe debe ser superior a cero",
                        ""
                      )
                    )
                  },
                  align: "RIGHT"
                ),
                a!richTextDisplayField(
                  value: {
                    a!richTextIcon(
                      icon: "times-circle",
                      link: a!dynamicLink(
                        value: remove(local!LineasPedido, fv!index),
                        saveInto: local!LineasPedido
                      ),
                      linkstyle: "STANDALONE",
                      color: "NEGATIVE"
                    )
                  }
                )
              }
            )
          ),
          addrowlink: a!dynamicLink(
            label: "Añadir nueva Línea de Pedido",
            saveInto: a!save(
              target: local!LineasPedido,
              value: append(
                local!LineasPedido,
                'recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido'(
                  'recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{71427dbb-12db-4f83-bd99-f625bf9af271}idPedido': ri!record['recordType!{3c95c0e4-e69d-43f6-b485-e72b24252af7}CPF Maestro Pedidos.fields.{7309402c-2312-4a4e-bdaa-5654789bffb2}idPedido'],
                  'recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{464f0883-d6d5-4c58-b054-4de8e9e99902}Proveedor': ri!record['recordType!{3c95c0e4-e69d-43f6-b485-e72b24252af7}CPF Maestro Pedidos.fields.{e11e6206-fc23-4a4b-9819-4db5a5bab685}nomProveedor'],
                  'recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{121ba298-9b36-4826-a191-72811974ee3c}createdOn': now() + intervalds(2, 0, 0),
                  'recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{4d0599e0-d6d6-4ad2-9a4a-8e7f3c270de9}createdBy': loggedInUser(),
                  'recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{fcfa4b36-4398-4430-8055-ecfa59daf13a}idLineaPedido': count({ local!LineasPedido }) + 1
                )
              )
            )
          )
        )
      }
    ),
    a!buttonLayout(
      primaryButtons: {
        a!buttonWidget(
          label: "Completar Creación Pedido",
          saveInto: a!save(
            ri!recordLineasPedido,
            local!LineasPedido
          ),
          submit: true,
          style: "PRIMARY",
          validate: true
        )
      },
      secondaryButtons: {
        a!buttonWidget(
          label: "Cancelar",
          value: true,
          saveInto: ri!cancel2,
          submit: true,
          style: "NORMAL",
          validate: false
        )
      }
    )
  }
)

Thanks a lot!

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