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There should be an unique transaction ref no. (could be auto generated or passed manually) for all savings transactions.
Use case 1: Savings account with withdrawal charges
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On account withdrawal, withdrawal and withdrawal charges transactions should be in a single transaction scope and refer a single transaction ref no.
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Should allow to reverse the transactions based on transaction ref no.
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Should have a de duplicate check of ref no. e.g. should not allow to make another transaction using same ref no.
Use case 2: Savings account to account transfer.
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On account to account transfer, all transactions including charges should be in a single transaction scope and refer a unique transaction ref no.
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Should allow to reverse the transactions based on transaction ref no.
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Should have a duplicate check of ref no. e.g. should not allow to make another transaction using same ref no.
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