Can't write multiple records with same relational ID

Question

The input "Records" cannot insert or update a record which is referring to different referenced records via propostaId at the same time. To create a reference to a related record, include either a relationship reference or the required common field value for "propostaId". Location of conflicting changes: GC Document [1]

= a!forEach(
 pv!documentos,
 a!update(
 fv!item,
 'recordType!{GC Documento .fields.{389973d7-a3f2-4ce3-aafb-9c2021e72ce9}propostaId',
 pv!idProposta
 )
)

I can't find anything about this error at all

Gem Anonuevo · Accepted Answer

I encountered the same issue and tried to use record relation instead of the common field, which resolved the problem for me. 
 
 Stefan Helzle said: Can you share the state of that process variable before you try to write it to the record? 
 - pv!comment is saved using "Write Record" node then update the "pv!comment" using the same node

Mathieu Drouin · Answer

This thread might be helpful: https://community.appian.com/discussions/f/data/30937/the-input-records-must-refer-to-record-types-with-data-sync-enabled-that-use-a-database-as-the-source-received-the-record-type-name-which-is-related-to-the-the-record-given-in-input?pifragment-13604=2 
 It could be related to the version of Appian you're running and if you related record data type is from a different source. 
 Alternatively, did you try using a constructor instead of an update statement? 
 i.e.

Can't write multiple records with same relational ID

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