I am trying to import into NetSuite customer payments. This works well. However, I want the integration to apply to account as an unapplied payment if the invoice number cannot be found on the "Invoices | Ref Num" mapping.
I've tried doing a lookup and using an 'empty string as default value' or 'null as default value' thinking the integration would then unapply it to no luck. I keep getting "Failed to create, update/transform record because You have attempted an invalid sublist or line item operation." error. Any ideas?
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