Open Settings > Accounting integration.

Review the selected accounting system and connection status.

If the connection is not established, sign in or test the connection and complete any required company selection.

If records fail after connection, review payment-method mappings, VAT/account mappings, factoring or payroll setup when applicable, and the integration start date.

Confirm that the affected customer, product, employee, project, department, invoice, or salary record has the external identifiers required by the configured system.

Save corrected mappings before retrying synchronization.

Retry one affected record where the workflow permits it; do not create duplicates in the accounting system.

Record the accounting system, entity type and ID, time, exact error, and whether the connection test succeeds.

Contact Between support when the same error remains. Never send passwords, API secrets, or full accounting credentials.