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You can either directly go to the document number via FBV0 and view the double entry or you can go t vendor line item display FBL1N and and check for duplicate reference/amount/date/ etc. and FBL3N for the bank out verification
How to lock invoices in SAP regarding vendors/Accounts Payables?
You can go to FBL1N- Vendor Display and view for all the open/cleared/reversed/parked invoices as required.
How to lock time period in SAP?
You can view it using the Tcode FKN - Display Balances. you can even double click it and view the individual breakup as well.
Note: Please note that i have answer only the basic guidance. Please revert if you require detailed procedure and guidance.