"You can only use one foreign currency per transaction." error when syncing with QuickBooks online.

The sync error "Business Validation Error: You can only use one foreign currency per transaction." is a result of incorrect GL Account configuration. Read on to learn how to prevent this error.

Error    Invoice    Error creating QB invoice from Acctivate a7549071-342e-494e-aa2f-13ac698b2304 (123456): BadRequest. Details: Business Validation Error: You can only use one foreign currency per transaction. 

An error similar to the one above means that GL accounts associated with the a transaction may be configured incorrectly.

The above error can happen if you've created an invoice for a customer who is associated with one currency code, such as USD, while one of the income or COGS accounts used on the invoice details is in another currency, such as CAD.

Income and COGS accounts are always in QuickBooks company's home currency. Other account types, such as assets or liabilities, can be in a foreign currency.

If you map an asset or liability account to Acctivate sales or COGS account fields, you could encounter this error if the asset or liability currency is different than the customer's currency.

To avoid this, make sure you're only choosing sales/income accounts and COGS/Expense accounts for Acctivate's income/COGS account mappings.

If you're experiencing this error, you'll need to update the income/COGS accounts, then void the invoice, then try invoicing again. You may need to toggle the field that is mapped to the income and COGS accounts (such as the Product Class or Branch field).