Resolve this error by following the steps below

Navigate to NetSuite

Select Lists > Relationships > Vendors > Search

On the next page, search for the vendor from Plate IQ that generated the flagged invoice.

At the bottom of the vendor page, select Edit to add a subsidiary.

From the dropdown, add the correct subsidiary. Click Save when finished.

Navigate back to Plate IQ. Click Resolve Flag. 

Click Export and the invoice will flow to NetSuite properly.

Note: You may need to refresh your NetSuite to see the invoice populate