After the import process builds the invoices, the invoices can be viewed, modified, and validated on the Manage Invoices page.
References:https://fusionhelp.oracle.com/helpPortal/topic/TopicId_P_A149B7BD08207B6DE040D30A68816335

Error: A percentage is used to calculate an error. The error tolerance amount is calculated as follows:
Policy Rate * (1+Error Tolerance/100)
References:https://docs.oracle.com/cd/E60665_01/financialscs_gs/FAIEX/F1456644AN125F2.htm

Standard invoice request: An invoice submitted without a purchase order by a supplier through Oracle Fusion Supplier Portal thatis pending review and approval by the appropriate persons within the deploying company.
References:https://docs.oracle.com/cd/E37583_01/doc.1116/e22897/F431919AN100ED.htm

Using the Resolve Document Validation Errors Page, you may review the errors and takeaction. You may fix related data, such as third party payee information, and submit the documents for revalidation. You may also remove documents from the Payment Process Request, which sends the documents back to the source product with the validation failure reason, just as rejection does.
References:https://docs.oracle.com/cd/E18727_01/doc.121/e13415/T456136T484670.htm

Assigning a reference data set to a business unit: When you define a business unit, assign the business unit a reference data set for the Payables Payment Terms reference group.
Before you define common options for Payables and Procurement, you must assign the Immediate payment term to the reference data set for the business unit.