Where can I find the POS365 loss and gain account?
You want to check the selected balancing account.
Note: This FAQ uses the POS365 Manager role and English page names. If your screen looks different, follow Access the POS365 UI (user interface) Manager role in Business Central. Changing the language to English is optional, but makes it easier to follow this FAQ.
Answer:
In POS365 Navigation, under POS365 Setup, select PON Integration Setup. On the POS365 Company Integration Setup [PON] list, find the relevant company's row and scroll horizontally to Loss/Gain Bal. Account, between General Ledger Journal and Rounding Bal. Account.