In addition, posting Financial statement you might get an error 'Account number for Transaction type Ledger journal does not exist'. If you create Bank drop operations in POS from 'Manage safes' menu – this means Safe is involved into operations – then you need to set up Safe ledger account in Cash payment method (Posting Tab/section Safe transaction). If you will not set up this ledger account – the Financial statement posting will fail with error ‘Account number for Transaction type Ledger journal does not exist’.