We are facing very frequently issue in number sequence/ voucher series. Accounts Payable->Journals->Vendor payment journal has voucher series in Journal Lines i.e. LedgerJournalTrans.voucher.
Here in this voucher series every now and then it is getting duplicated.
Following below are some of our number sequence settings:
Clean up: No (Here we remove this checked option after facing this duplicate issue but still no effect)