Exchange Rates json isn't updating the currency exchange rates table

Summary:

Trying to patch exchange rates but Exchange Rates json isn't updating the currency exchange rates table

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25B

Code Snippet (add any code snippets that support your topic, if applicable):

{                    "currencyExchangeRateID":{ "value":"1048"},                    "effectiveDate": {                            "value": "2025-08-12"},                    "exchangeRateGid":{                             "value": "TTE.TEST_RATE"},                    "currencyExchangeRates": {                        "items": [                            {                                "fromCurrencyGid": "USD",                                "toCurrencyGid": "INR",                                "exchangeRate": "81",                                "fractionalDigits": "1"                            }                        ]                    }}