If the receivable amount from a sales invoice is posted to an account other than 1210 Trade receivables, it indicates that the wrong receivables account is set on the client card.
However, if the sales income is posted to a cash account (the most common mistake), it means the wrong income account is assigned on the item card.

Go to Partners -> Clients and suppliers, search for the client whose invoice transaction you see posted to the wrong account.. Open the client card and select Edit client/supplier from the Action menu. Then go to the “Client/Supplier settings panel” and check the following:

• Receivables account – determines which account is used to record the receivable from the client when a sales invoice is created.
• Liabilities account – determines which account is used to record the liability to the supplier when a purchase invoice is entered.

These fields only need to be filled in if you want to use an account different from the default setting for receivables or liabilities. If you need a separate receivables or liabilities account, create a new account close to the number of the default account.

Example:
1210 Trade receivables -> add 1211 as an alternative
2310 Trade creditors -> add 2311 as an alternative
When adding new accounts, make sure they are also linked to the necessary reports.

You can view the accounts used in the default settings under Settings -> Automatic transactions.

If the company uses items, you must also check that the item card has the correct sales income account and inventory/expense account assigned. A common mistake is assigning a cash account (1010, 1020) as the sales income account. The sales income account must always start with 4.
For more information about the difference between service and warehouse items, see the user guide.

• If there are errors in the income accounts of sales invoices, you must open the invoices and correct the income account on the invoice line. See the guide “Sales invoice entry view settings”, section “Invoice line panel”, for instructions on how to access additional line details and change the income account.
• If the errors are in receivables or liability accounts, the settings must be corrected first. After fixing the settings, all invoices containing incorrect data must have their transactions updated. The easiest way to do this is to open the invoice and select “Delete financial transaction” from the Actions menu. This will delete the incorrect transaction and automatically create a new one with the correct accounts.