For the Shopify Order Import and Item Mass Update flows, the connector looks for the SKU of an item in NetSuite by searching for the SKU in the ItemID field. The following error may occur when more than one match is found.
'A mapping error occurred. More than one match for "[["itemid","is","OZ-SE-VCA-
This is a NetSuite issue where the ItemID and Vendor code matches, and the search returns all the items. In this example, NetSuite returns two results.
To resolve this issue, use the Name (Internal) in the mapping for the SKU. This is how it looks like in integrator.io: