Add Row Link with a record type

Hello, I have a parent recordtype Claim which has a relationship with a transaction, a rule can have several transactions, I want to save more than one record within the recordtype but when saving I get the following error:

Could not display interface. Please check definition and inputs.
Interface Definition: Expression evaluation error [evaluation ID = 6a3c5:31751] : An error occurred while executing a save: Expression evaluation error at function 'append' [line 492]: Insert is not supported for AOC TRANSACTION types

Main recordType

'recordType!{5871e10b-6fc1-4f38-a51a-becdd72dcf12}AOC CLAIM'(
  'recordType!{5871e10b-6fc1-4f38-a51a-becdd72dcf12}AOC CLAIM.fields.{85821409-5bf4-46d5-ae14-0102b7127440}product': "CUENTA DE AHORROS - 04010020101 - activo",
  'recordType!{5871e10b-6fc1-4f38-a51a-becdd72dcf12}AOC CLAIM.fields.{9dc19019-1bdf-453f-865f-ebbaecd94957}relatedToVisaCard': true,
  'recordType!{5871e10b-6fc1-4f38-a51a-becdd72dcf12}AOC CLAIM.fields.{0bf5aae9-6379-48a0-b28e-e536c5fe8f06}cardNumber': "4572457257257277",
  'recordType!{5871e10b-6fc1-4f38-a51a-becdd72dcf12}AOC CLAIM.fields.{00946d17-a3c8-49c0-8d4f-ec426a548478}reasonId': 2,
  'recordType!{5871e10b-6fc1-4f38-a51a-becdd72dcf12}AOC CLAIM.relationships.{d587c4bb-56b0-4cee-ace5-b5fb09f16ec6}document': null,
  'recordType!{5871e10b-6fc1-4f38-a51a-becdd72dcf12}AOC CLAIM.fields.{8091660f-289c-4551-a470-f4a02d78cee1}description': "",
  'recordType!{5871e10b-6fc1-4f38-a51a-becdd72dcf12}AOC CLAIM.relationships.{29e70da0-ba19-454b-b908-49c5ff27bf2e}transaction': 'recordType!{e83b530b-33f6-476a-833d-4e3722449728}AOC TRANSACTION'(),
  'recordType!{5871e10b-6fc1-4f38-a51a-becdd72dcf12}AOC CLAIM.fields.{062bb7f0-1333-437b-83e0-639c5885c60e}paymentMethodId': fn!tointeger(null)
)

my table code to add a new record is as follows:

addRowLink: a!dynamicLink(
                      label: "Añadir",
                      value: 'recordType!{e83b530b-33f6-476a-833d-4e3722449728}AOC TRANSACTION'(),
                      saveInto: {
                        a!save(
                          ri!record['recordType!{5871e10b-6fc1-4f38-a51a-becdd72dcf12}AOC CLAIM.relationships.{29e70da0-ba19-454b-b908-49c5ff27bf2e}transaction'],
                          append(ri!record['recordType!{5871e10b-6fc1-4f38-a51a-becdd72dcf12}AOC CLAIM.relationships.{29e70da0-ba19-454b-b908-49c5ff27bf2e}transaction'],save!value)
                        )
                      }
                    ),

Only works with the first registration

and when I try to add a new record it sends me the following error: