Hi
I tried out your example
#+begin_src ledger
= expr account =~ /Liabilities:[a-zA-z0-9]*$/ and aux_date >= [2020/05]
$account -1.0
$account:from User1 (roundto(0.5*amount, 2))
$account:from User2 (amount-roundto(0.5*amount, 2))
2021-12-03=2021-12-05 Amazon
Expenses:Presents 2000 JPY
Liabilities:User1
2021-12-05=2021-12-07 eBay
Expenses:Presents 3000 JPY
Liabilities:User2
#+end_src
#+RESULTS:
#+begin_example
5000 JPY Expenses:Presents
-5000 JPY Liabilities
-2000 JPY User1
-1000 JPY from User1
-1000 JPY from User2
-3000 JPY User2
-1500 JPY from User1
-1500 JPY from User2
--------------------
0
#+end_example
I rather don't know how to interpret the result, I hoped I would
automatically know who has to pay whom, what amount. But it seems that
further investigation is necessary, as you seem to indicate
by saying
,----
| and then you can look at the minimum of "User1:from User2" and
| "User2:from User1" and compute the reimbursement account.
`----
In my approach I had also to calculate the money to be transferred from
one user to the other.
Now what puzzles me is
#+begin_src ledger
= expr account =~ /Liabilities:[a-zA-z0-9]*$/ and aux_date >= [2020/05]
$account -1.0
$account:from User1 (roundto(0.5*amount, 0))
$account:from User2 (amount-roundto(0.5*amount, 0))
2021-12-05=2021-12-07 User1
expenses:Jacket 80
Liabilities:User1
2021-12-05=2021-12-07 User1
expenses:Pajama 30
Liabilities:User1
2021-12-05=2021-12-07 User2
expenses:Flowers 20
Liabilities:User2
2021-12-05=2021-12-07 User2
expenses:ChristmasTree 40.00
Liabilities:User2
#+end_src
Here, ledger does not do anything.
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