Save fields of multiples rows without showing

Hi! I have created the following editable grid:

Appart from the fields shown in the editable grid, I would like to create for each row a CONCAT() from two fields (idPedido, Material), BUT NOT SHOW IT IN THE EDITABLE GRID, only saving it into my local variable 

I´ve tried with the following code but when I try to add a new row an error appears: fv!item not detected (line 189). Is my approach of trying to save it in the append correct? In case it is correct, how can I fix the code and the fv!item? If not, which is the best way to save it in the local variable or another way?

Thanks a lot!

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: "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: "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!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,
                  'recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{caf81eeb-f499-4adc-b078-f2692f6e38b2}ConcatPedidoMaterial': 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']
                  ) 
                  
              
                 
                )
              )
            )
          )
        )
      }
    ),
    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
        )
      }
    )
  }
)

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