The session close at an Odoo POS till is the moment the day is actually known, and it is also the moment SAP ECC could be given the entry rather than waiting for somebody to type it in.
A shop's trading day ends when the till is cashed up, and the finance record of that day begins the next morning when somebody types the totals into the ERP. In between, nobody in the business can say what the group actually took yesterday. Add a second shop and the delay compounds, because the ledger now waits on the slowest person to send their figures in, and a third one makes chasing them somebody's job every week. Connecting SAP ECC - R/3 and Odoo POS turns the session close into the entry, so the day reaches the books as the tills finish.

When a till session closes in Odoo POS, the takings reach SAP ECC as an entry rather than as a figure somebody will key in the following morning from a printed summary sheet.
Card, cash and voucher arrive as distinct amounts rather than one total, so reconciling what the bank received against what the shop took is arithmetic instead of an investigation.
A refund taken at the counter belongs to the session it happened in, so a day does not post clean in the morning and then need correcting once somebody spots the returns.
Another till or another branch posts the same way the first one does, so growing the estate does not also grow the number of people sending figures somewhere by hand each evening.
When a till session is closed in Odoo POS, Alumio posts the takings to SAP ECC with the payment types kept apart, so the group's position for that day is known by the evening rather than by the middle of the following week.
When another shop starts trading, its sessions post the same way the first one's already do, so the group's daily figure no longer depends on whether every manager remembered to send their totals in before going home.
When a refund is taken after a session has already been closed, it is attached to the session it belongs to rather than to the one that happens to be open, so neither day ends up describing the other day's trading.
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Once the day reaches the ledger by itself, the next gap is the bank. A cash collection service knows what was physically banked and the ERP knows what the tills said was taken, and nobody currently compares the two until a month end. Alumio holds that connection alongside this one, so the difference is visible while somebody can still remember the day.
Yes, and the session close is the natural trigger rather than a clock. A day that is still trading is not a day anybody wants posted, so Alumio waits for the close and then writes the entry with the payment types separated, on the schedule you set for each shop. What can be posted is whatever SAP ECC exposes for it.
No, and the consequence is that a shop opening next month does not need anybody technical. What makes that possible is that Odoo POS already publishes what it makes available, and Alumio works within that rather than waiting on anything being built. How a till's takings map onto ledger entries is configuration somebody in finance can read, with the Code Transformer covering a shop that books differently from the rest.
At the session close, which is the only moment the day is actually final. Before that the figure is still moving and after that it is waiting on a person. Posting on the close means the group's position for the day exists the same evening, which matters most on the days somebody needs to know before the morning, such as the end of a promotion or the end of a period.
The one that goes unnoticed is a session posted before its refunds were, because the entry balances and the shortfall appears somewhere else weeks later. Alumio names the session and the entry it was missing. Each transfer is monitored live and logged with what it carried, a refusal alerts with the reason, retries run where configured, and nothing is lost quietly.
Talk to an Alumio integration specialist. We'll map the right architecture for your systems, at the right scale, so your operations stay reliable through every change.