Finance
One ledger that everything in the business reaches — balanced, dated, in its own currency at its own frozen rate. No figure in a report without an entry behind it.
One door into the ledger
An invoice, its journal entry and its open item are raised in a single call, so there is no window in which a customer owes money that the books have not recorded. Operational modules never post for themselves; they go through posting rules an accountant can read and audit.
More than one currency on one job
Revenue in dollars against costs in two other currencies on the same trip. The rate is frozen on the document the day it is raised, and the exchange difference is realised when the money moves — not recalculated when somebody reopens the file.
Treasury, and cheques as their own thing
A receipt settles a specific open item rather than a balance. A cheque posts when it changes hands, not when it clears: the customer has discharged the invoice, and what you hold instead sits in a holding account agreed against the register line by line.
Bank reconciliation that posts nothing
Ticked lines are agreed against the statement and no figure is stored. Completing is refused while a difference remains, because what is missing is almost always a bank charge nobody entered — and it belongs in the ledger as its own dated entry, not as a rounding.
The tax return is read from documents
Taxable base beside each rate and each code, converted at every document’s own frozen rate, credit notes subtracted. A tax account balance is one number and answers neither question.