Some referenced Items could not be found, process model

Hi, 

I am running a process model and I want it to write/update record information after an input task.

If they hit accept, the write records data service works perfectly but if they hit the reject button the write record service throws the following error: "Some referenced Items could not be found".

What am I doing wrong? I'll share the buttons' interface code: 

buttons: a!buttonLayout(
primaryButtons: {
a!buttonWidget(
label: "Aprobar",
saveInto: {
a!save(
ri!record['recordType!{cef91250-961d-44c5-a3d4-47f5dd11ce8e}W1181S Solicitud.fields.{8765b93b-701f-4834-a1fa-466d22579f09}clausuraFecha'],
today()
),
a!save(ri!record['recordType!{cef91250-961d-44c5-a3d4-47f5dd11ce8e}W1181S Solicitud.fields.{52961fd0-4d58-4b78-a648-5fe0de023217}personaDecision'],
loggedInUser()
),
a!save(
ri!record['recordType!{cef91250-961d-44c5-a3d4-47f5dd11ce8e}W1181S Solicitud.fields.{c9e90275-1a59-4f5c-a413-b7ed27eed6b1}idEstadodeSolicitud'], 3
),
a!save(
ri!decisionDeApruebo, true()
)
},
submit: true,
style: "SOLID"
)
},
secondaryButtons: {
a!buttonWidget(
label: "Rechazar",
value: true,
saveInto: {
a!save(
ri!decisionDeApruebo, false()
),
a!save(
ri!record['recordType!{cef91250-961d-44c5-a3d4-47f5dd11ce8e}W1181S Solicitud.fields.{c6d7ad75-b919-495e-acf8-cab91fe967c8}idSolicitud'], 4
),
a!save(
ri!record['recordType!{cef91250-961d-44c5-a3d4-47f5dd11ce8e}W1181S Solicitud.fields.{8765b93b-701f-4834-a1fa-466d22579f09}clausuraFecha'], today()
),
a!save(
ri!record['recordType!{cef91250-961d-44c5-a3d4-47f5dd11ce8e}W1181S Solicitud.fields.{52961fd0-4d58-4b78-a648-5fe0de023217}personaDecision'], loggedInUser()
)
},
submit: true,
style: "OUTLINE",
disabled: if(a!isNotNullOrEmpty(ri!record['recordType!{cef91250-961d-44c5-a3d4-47f5dd11ce8e}W1181S Solicitud.fields.{25e11a33-589d-4704-8244-bdeda69e2b92}razonDeRechazo']),
false,
true
),
validate: true
)
}
)

Screenshot of error:

Any help is appreciated.