We followed the definition described in ISO20022, the “identification” has the Datatype “Max256Text”
i.e. source ISO20022_MDRPart2_PaymentsInitiation_2023_2024_v1 (page 341)
6.1.12.1.3.1.3.1 Identification <Id>
Presence: [1..1]
Definition: Identification assigned by an institution.
Datatype: "Max256Text" on page 430