If an entity has an audited BigDecimal property and an unaudited property that is changed in an update, an audit record is created, even if the BigDecimal value has not changed.

This ist due to the areEqual implementation in org.hibernate.internal.util.compare.EqualsHelper which simply calls the equals method instead of using "compareTo == 0" like the areEqual method in the org.hibernate.type.descriptor.java.BigDecimalTypeDescriptor