-- in.journal --
2024-01-01 groceries
  expenses:food  $10
  assets:cash

2024-01-01 groceries
  expenses:food  $10
  assets:cash

2024-01-02 taxi
  expenses:transport  $20
  assets:cash

2024-01-02 taxi
  expenses:transport  $20
  assets:cash

2024-01-03 unique
  expenses:misc  $5
  assets:cash

-- expect --
in.journal:5:1: duplicated-transaction: duplicate of transaction at line 1
in.journal:13:1: duplicated-transaction: duplicate of transaction at line 9