Error: variable(s) not found: local!data

your a!localVariables() definition is inside the contents parameter of your Form Layout.  That means when you try to call it from your Submit button, "local!data" is actually in a different scope and technically does not exist there.

your a!localVariables() definition is inside the contents parameter of your Form Layout.  That means when you try to call it from your Submit button, "local!data" is actually in a different scope and technically does not exist there.

Thank you so much for your answer! I have put the local variable outside the form, as you said, so the error I mentioned has dissapeared. But now another error has come in the step to write the data introduced into the record: 

As before, I leave the new code of the interface:

a!localVariables(
  local!data,
  {
        a!gridLayout(
          label: "A continuación, incorpore las líneas de factura correspondientes y pulse el botón de creación",
          headerCells: {
            a!gridLayoutHeaderCell(label: "Id Factura"),
            a!gridLayoutHeaderCell(label: "Id Pedido"),
            a!gridLayoutHeaderCell(label: "Importe"),
            a!gridLayoutHeaderCell(label: "Proveedor"),
            a!gridLayoutHeaderCell()
          

          },
          columnConfigs: {
            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!data,
            expression: a!gridRowLayout(
              contents: {
                a!textField(value:fv!item['recordType!{b83ae990-aa66-4847-b974-1e1e40019294}CPF Maestro Líneas Factura.fields.{14eaacbb-19fc-41e2-aea2-3ec9b3322722}idFactura'], saveInto: fv!item['recordType!{b83ae990-aa66-4847-b974-1e1e40019294}CPF Maestro Líneas Factura.fields.{14eaacbb-19fc-41e2-aea2-3ec9b3322722}idFactura']),
                a!textField(value:fv!item['recordType!{b83ae990-aa66-4847-b974-1e1e40019294}CPF Maestro Líneas Factura.fields.{0674a81d-2d41-4f90-a871-1f29f4283a6e}idPedido'], saveInto: fv!item['recordType!{b83ae990-aa66-4847-b974-1e1e40019294}CPF Maestro Líneas Factura.fields.{0674a81d-2d41-4f90-a871-1f29f4283a6e}idPedido']),
                a!floatingPointField(value:fv!item['recordType!{b83ae990-aa66-4847-b974-1e1e40019294}CPF Maestro Líneas Factura.fields.{afbd0300-a83f-4cd5-8de9-740dab7d0ec8}totalPedidoFact'], saveInto: fv!item['recordType!{b83ae990-aa66-4847-b974-1e1e40019294}CPF Maestro Líneas Factura.fields.{afbd0300-a83f-4cd5-8de9-740dab7d0ec8}totalPedidoFact']),
                a!textField(value:fv!item['recordType!{b83ae990-aa66-4847-b974-1e1e40019294}CPF Maestro Líneas Factura.fields.{92d3b685-0289-4393-9c7e-c63a963dfa73}proveedor'], saveInto: fv!item['recordType!{b83ae990-aa66-4847-b974-1e1e40019294}CPF Maestro Líneas Factura.fields.{92d3b685-0289-4393-9c7e-c63a963dfa73}proveedor']

                ),
                a!richTextDisplayField(
                  value: {
                    a!richTextIcon(
                      icon: "times-circle",
                      link: a!dynamicLink(
                        value: remove(local!data, fv!index),
                        saveInto: local!data
                      ),
                      linkstyle: "STANDALONE",
                      color: "NEGATIVE"
                   )
                    
                  }
                )
                
              }
            )
          ),
          addrowlink: a!dynamicLink(
            label: "Add new Invoice Line",
            value: append(
              local!data,         
              'recordType!{b83ae990-aa66-4847-b974-1e1e40019294}CPF Maestro Líneas Factura'()
            ),
            saveInto: local!data
          )
        )
,
  a!buttonLayout(
    primaryButtons: {
      a!buttonWidget(
        label: "Completar Creación Factura",
        saveInto: a!writeRecords(
          records:local!data,
          onSuccess: a!save(local!data, fv!recordsUpdated)
        ),
        submit: true,
        style: "PRIMARY",
        validate:true
      )
    },
    secondaryButtons: {
      a!buttonWidget(
        label: "Cancelar",
        value: true,
        saveInto: ri!cancel,
        style: "NORMAL"
      )
    }
  )

}
)

I revised the inputs and all of them are in the record type. I don´t know what is generating this error. 

Again, thank you so much!

The data should be getting written here, so I'm unclear why you're trying to do it a second time in a Process Model node.  Are you saying you want to do it in the process model instead of on Submit Click?

Edit to add: what node is actually causing the failure?  How exactly is it configured?  I can't tell much from your process instance screenshot.

Hi! The node which is causing the failure is the second one:

I tried to remove the second "write records" node and the first part of the process is OK (user enters fields in the first interface, they are saved correctly in my first record and after that, a second interface appears), but the fields in my second interface "Cubrir Formulario" are not saved in the second record.

• Configuration of "Cubrir formulario lineas fact":

• Configuration of "Rellenar base datos lineas":

I tried to remove the second "write records" node and the first part of the process is OK (user enters fields in the first interface, they are saved correctly in my first record and after that, a second interface appears), but the fields in my second interface "Cubrir Formulario" are not saved in the second record.