@HansK2, I think Visma.Net uses "JsonIgnoreCondition.WhenWritingNull" so properties are never null in responses, they are ignored. i.e. undefined in js-terminology. In...
API - Due dates for breaking changes
Release Notes
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Due
Deprecated parameter releasedBatch on JournalTransactionV2 GET
In version 10.39.0 we have introduced a new...