Hledger.Data.Balancing

Legacy form of transactionCheckBalanced.

Balance this isolated transaction, ensuring that its postings (and its balanced virtual postings) sum to 0, by inferring a missing amount or conversion price(s) if needed. Or if balancing is not possible, because the amounts don't sum to 0 or because there's more than one missing amount, return an error message.

Note this is not as accurate as balanceTransactionInJournal, which considers the whole journal when calculating balance assignments and balance assertions.

Helper used by balanceSingleTransaction and balanceTransactionWithBalanceAssignmentAndCheckAssertionsB; use one of those instead. It also returns a list of accounts and amounts that were inferred.

Verify that any assertions in this transaction hold when included in the larger journal.

Infer any missing amounts and/or conversion costs (as needed to balance transactions and satisfy balance assignments); and check that all transactions are balanced; and (optional) check that all balance assertions pass. Or, return an error message (just the first error encountered).

Assumes journalStyleAmounts has been called, since amount styles affect transaction balancing.

This does multiple things at once because amount inferring, balance assignments, balance assertions and posting dates are interdependent.