Tax-releated errors

The Investment API returns synchronous order creation errors in the following cases:

Error code	Description
`UserNotFound`	The user cannot be found.
`TaxExemptionNotFound`	The tax exemption cannot be found.
`InvalidUserID`	The user ID is not valid.
`InvalidTenantID`	The tenant ID is not valid.
`InvalidTaxExemptionID`	The tax exemption ID is not valid.
`InvalidUserIDsArray`	The user IDs list is not valid.
`InvalidTaxExemptionAmount`	The given tax exemption amount is invalid: it must be a number greater than zero and up to two decimal places.
`AmountExceedsMaximumAllowed`	The tax exemption amount exceeds the maximum allowance for the fiscal year.
`InvalidCurrency`	The given currency is invalid or not supported.
`TaxExemptionTypeNotSupported`	The given tax exemption type is invalid or not supported.
`CountryNotSupported`	The given country is invalid or not supported.
`ValidToDateLessThanCurrentYear`	The `valid_to_date` year cannot be prior to the current fiscal year.
`ValidToDateMustBeLastDayOfYear`	The `valid_to_date` must be the last day of the fiscal year (YYYY-12-31).
`TaxExemptionAlreadyExists`	An active tax exemption already exists for at least one affected user.
`TaxExemptionNotActive`	The tax exemption is not in an active status.
`TaxExemptionUtilised`	The tax exemption has already been utilised.
`InternalError`	An unexpected internal error occurred.