Missing account coding data for Invoices in Workflow tables in PROD

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Hello,

We have a custom BI report that tracks the Account coding details for AP Invoices. We are using the workflow tables to get these details. Per my understanding , all activities related to the account coding process on an invoce will be captured in the workflow tables.However, we see some scanned invoices with account coding status = Complete, Returned, Initiated, not having any entry in the fa_fusion_soainfra.wftask and fa_fusion_soainfra.wftaskhistory WF tables. This issue is seen in Production. 

Any insights on this would be very helpful.

Thank you.