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How to resolve a "Conversion from string '' to type 'Double' is not valid" error in SAP?

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Overview

The following error is occuring on sales orders or invoices:

AddFreightDiscrminated. Exception. Item - Form item is not editable

AddAvaTaxSalesTax. Exception. Conversion from string "" to type 'Double' is not valid.

Environment

SAP Business One

Resolution

Please contact Avalara support. This may be an issue that SAP needs to help with, we can take a look to determine if that is the case.