diff --git a/corepos/api.py b/corepos/api.py
index 3a8b624..b6ee1ed 100644
--- a/corepos/api.py
+++ b/corepos/api.py
@@ -2,7 +2,7 @@
 ################################################################################
 #
 #  pyCOREPOS -- Python Interface to CORE POS
-#  Copyright © 2018-2020 Lance Edgar
+#  Copyright © 2018-2021 Lance Edgar
 #
 #  This file is part of pyCOREPOS.
 #
@@ -487,3 +487,26 @@ class CoreWebAPI(object):
             if len(result) > 1:
                 log.warning("CORE API returned %s VendorItem results", len(result))
             return json.loads(result[0])
+
+    def set_vendor_item(self, sku, vendorID, **columns):
+        """
+        Update an existing VendorItem record in CORE.
+
+        :returns: Boolean indicating success of the operation.
+
+        .. note::
+           Currently this is being used to create a *new* product also.  CORE's
+           ``vendorItems`` table does not use auto-increment for its PK, which
+           means we must provide one even when creating; therefore this method
+           may be used for that.
+        """
+        columns['sku'] = sku
+        columns['vendorID'] = vendorID
+        params = {
+            'entity': 'VendorItems',
+            'submethod': 'set',
+            'columns': columns,
+        }
+        response = self.post(params)
+        result = self.parse_response(response)
+        return json.loads(result)