Simulating average cost booking seems like a good way to do this as well.
If I do not include the {} on the Old account though I end up with -30 AAPL
similar to the result in example 1. Adding the lost selector solves this
though.
Glad it helped! As you already mentioned, the underlying concepts of how
lot matching is done or not are a good idea to understand. In addition, how
those concepts are exercised based on your Beancount transaction syntax
would be very helpful. The good thing is, documentation for all those
things is excellent with Beancount.
With STRICT booking, if you augment (buy) 30 AAPL, then reduce (sell) -20
AAPL, the reduction will have to to be matched to the existing 30, and will
specifically reduce 20 out of the 30.
With NONE booking, if you do the same augment and reduction, then see this
doc
<https://beancount.github.io/docs/how_inventories_work.html#strict-booking>:
No Booking
<https://beancount.github.io/docs/how_inventories_work.html#no-booking>
However, there is another way to deal with non-taxable accounts in the
meantime: you can simply disable the booking. There is a booking method
called “*NONE*” which implements a very liberal strategy which accepts any
new lot.. New lots are always appended unconditionally to the inventory.
Using this strategy on the transactions from the previous section would
result in this inventory:
units ccy cost cost-ccy lot-date label 45.0045 VBMPX {11.11 USD,
2016-07-28, None} 54.5951 VBMPX {10.99 USD, 2016-10-12, None} -1.4154 VBMPX
{10.59 USD, 2016-12-30, None}
Observe how the resulting inventory has a mix of signs; normally this is
not allowed, but it is tolerated under this degenerate booking method. Note
that under this method, the only meaningful values are the *total* number
of units and the *total* or *average* cost amounts. The individual lots
aren’t really lots, they only represent the list of all postings made to
that account.
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