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For purchases made from a GST register trader in foreign currencies, the supplier has to reflect the GST payable on the invoice in Singapore dollars with an approved exchange rate. You, the buyer, should claim input tax based on Singapore dollar amounts shown on the tax invoice instead of conversion based on your in-house exchange rate.
For example, your in-house exchange rate is 1SGD:0.7400USD, but received a Bill from a supplier at a rate of 1SGD:0.7431USD. Then, you should record the Bill (Purchase Invoice) with an exchange rate of 1SGD:0.7431USD instead of using the system rate 1SGD:0.7400USD.
Assuming the GST amount of a Purchase Invoice is US$700. It will be $$945.95 (700/0.7400) if recorded based on system exchange rare of 1SGD:0.7400USD and S$942.00 if the exchange rate has changed to 1SGD:0.7431USD.
As you can see from the above illustration when the exchange rate changed, the GST amount in Singapore dollar changed.
Click the exchange rate button on top of the purchase invoice to change the exchange rate of a transaction in MoneyWorks accounting software.
Then, uncheck the 'Use system rate at posting time' checkbox from the Currency Rate wizard and amend the exchange rate for the transaction.