UC15_ISSUE INACCURATE POST error in Credit Note XML despite correct postal code

General
1

@Ankit.K.Tiwari , @idaoud

We submitted a Credit Note XML where the customer’s address details were included as shown below:

<cac:AccountingCustomerParty>
    <cac:Party>
        <cac:PartyIdentification>
            <cbc:ID schemeID="OTH">205400989W</cbc:ID>
        </cac:PartyIdentification>
        <cac:PostalAddress>
            <cbc:StreetName>15 PANDAN ROAD</cbc:StreetName>
            <cbc:BuildingNumber/>
            <cbc:CitySubdivisionName/>
            <cbc:CityName>SINGAPORE</cbc:CityName>
            <cbc:PostalZone>609263</cbc:PostalZone>
            <cac:Country>
                <cbc:IdentificationCode>SG</cbc:IdentificationCode>
            </cac:Country>
        </cac:PostalAddress>
        <cac:PartyLegalEntity>
            <cbc:RegistrationName>ABC PTE. LTD.</cbc:RegistrationName>
        </cac:PartyLegalEntity>
    </cac:Party>
</cac:AccountingCustomerParty>

However, we received an email from ZATCA stating: UC15_ISSUE NACCURATE POST.

The postal code 609263 is valid for Singapore, so I’m not sure why this error was triggered.
Can anyone confirm what exactly causes this error and how to resolve it?