Decimal type does not allow to store some ISO20022 fields

We’re having a hard time with differences in Decimal between DAML and other environments. In particular the usage of it in ISO20022 (yes - a big subject area, but stick with me here…). ISO20022 uses decimals in many contexts, but they are specializations of the most general xsd definition for the type DecimalNumber:

    <xs:simpleType name="DecimalNumber">
        <xs:restriction base="xs:decimal">
            <xs:fractionDigits value="17"/>
            <xs:totalDigits value="18"/>
        </xs:restriction>
    </xs:simpleType>

Example: https://www.iso20022.org/sites/default/files/documents/messages/sese/schemas/sese.023.001.09.xsd

• How do we deal with scenarios that need > 10 decimal places
• Less bounded decimals / dependent types like Decimal[28,8]? 😃
• Should we consider using Sci notation instead
• Note that the above XSD notation is different from SQL, in that the latter has a fixed fractional digits

[raphael-speyer-da]

IIUC the schema means that their DecimalNumber has a max precision of 18, and max scale of 17, so we’d need to support.

[
  123456789012345678.0,
  0.12345678901234567,
  1.23456789012345678
] : [Decimal]

[gerolf-da]

This has been fixed by #2289.