What is a necessary step when a specialist notices data inconsistencies in supplier invoices?

The necessary step when a specialist notices data inconsistencies in supplier invoices is to document the findings. Documenting the findings allows the specialist to create a record of the specific inconsistencies observed, which is crucial for further investigation and resolution. This step ensures that there is a clear trail of evidence that can be referenced later, whether for auditing purposes, for communicating with the supplier, or for adjusting internal processes to prevent similar issues in the future.

Creating a custom validation is not typically the immediate response to observing inconsistencies; instead, it might be a longer-term action taken after the inconsistency has been properly analyzed and understood. Notifying management may also be important, but it typically follows the documentation step, as management needs to be informed of the findings and the potential impact based on the documented evidence. Initiating a system update would generally be part of a corrective process but is not an appropriate immediate response to inconsistencies detected in invoices. Thus, documenting the findings serves as the foundational step in properly addressing the inconsistencies.