The currency was delivered as a symbol (€) or in lower case.
Fix
Use the three-letter ISO 4217 code in upper case (EUR, USD).
Wrong and right
Wrong
{ "currencyType": "euro" }
Right
{ "currencyType": "EUR" }
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Attribution. Source: SIVI – VB-PUO Standard. Schemas, attribute descriptions and code lists are taken unchanged from the VB-PUO Standard (owned by the Pensioenfederatie, managed by SIVI) and shown with their release and version. Explanations, examples, error descriptions and translations are by WTP Data Lab and are not part of the standard. GitHub Stichting-SIVI/VBPUOdsk · Manual · sivi.org