Amounts are passed unrounded from a calculation (for example 500000.123).
Fix
Round amounts to two decimals before serialising; make sure your validator tests multipleOf with sufficient precision (AJV: multipleOfPrecision).
Wrong and right
Wrong
{ "startAmount": 500000.123 }
Right
{ "startAmount": 500000.12 }
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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