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Entering the original invoice number in the invoice reference field is the correct method for verifying the validity of payment terms related to a credit memo. This process allows for a direct connection between the credit memo and the original invoice, making it clear what terms were initially agreed upon and ensuring consistency in accounting practices. By referencing the original invoice, you can accurately assess whether the credited amount corresponds to the specified payment terms, thereby facilitating clarity and accuracy in financial transactions.

While reviewing the credit memo details for discrepancies can provide useful insights, it does not directly confirm the payment terms outlined in the original invoice. Consulting the vendor for validation is a possible approach but may not be as efficient or definitive as directly referencing the original document within the system. Checking the payment history of the invoice could offer additional context about how the payment terms were applied in practice, yet it does not provide a direct verification of the terms themselves, which is the primary need in this scenario.