New issue 354: Lot reduction fails on positive entry
https://bitbucket.org/blais/beancount/issues/354/lot-reduction-fails-on-positive-entry
Ilya Kuzmich:
Booking will fail to match positive at cost entry against negative one, if negative comes first.
Sample journal:
```
option "booking_method" "FIFO"
plugin "beancount.plugins.auto"
1970-01-01 txn "remove"
Assets:Foo -1 AA { 1 USD }
Assets:Bar
1970-01-01 txn "add"
Assets:Foo 2 AA { 1 USD }
Assets:Bar
```
It's not a problem usually, unless "remove" and "add" tx's are in different files, and "remove" sorted first by the lineno.