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ISO20022 describes StatusIdentification, OriginalInstructionIdentification, OriginalEndToEndIdentification and OriginalTransactionIdentification (StsId, OrgnlInstrId, OrgnlEndToEndId, OrgnlTxIdas) as follows:
Definition: Unique identification, as assigned by an instructing party for an instructed party, to unambiguously identify
the reported status.
Usage: The instructing party is the party sending the status message and not the party that sent the original
instruction that is being reported on.
Data Type: Max35Text, Format: maxLength: 35, minLength: 1
To conclude, the element is optional by schema and it has to be unique. Uniqueness is checked by the validator within one message.