🟢 fix

Author: pierrecamilleri

frictionless/resources/table.py

@@ -233,16 +233,16 @@ def __open_lookup(self):
             # Prepare source
             source_name = fk["reference"]["resource"]
             source_key = tuple(fk["reference"]["fields"])
-            if source_name != "" and not self.package:
-                continue
-            if source_name:
+            if source_name and source_name != self.name:
                 if not self.package:
-                    note = 'package is required for foreign keys: "{fk}"'
+                    note = (
+                        'package is required for foreign keys to other resources: "{fk}"'
+                    )
                     raise FrictionlessException(errors.ResourceError(note=note))
                 if not self.package.has_resource(source_name):
                     note = f'failed to handle a foreign key for resource "{self.name}" as resource "{source_name}" does not exist'
                     raise FrictionlessException(errors.ResourceError(note=note))
-                source_res = self.package.get_resource(source_name)
+                source_res = self.package.get_resource(source_name).to_copy()
             else:
                 source_res = self.to_copy()
             if source_res.schema: