How to fix the Oracle error LSX-00168: referring form of “~S” must NOT occur at the top level?

In this post, you’ll learn more about the Oracle ErrorLSX-00168: referring form of “~S” must NOT occur at the top level with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

LSX-00168: referring form of “~S” must NOT occur at the top level

Reason for the Error LSX-00168: referring form of “~S” must NOT occur at the top level

Cause: The referring form did not occur within a complex type definition or an attribute group definition.

How to fix the Error LSX-00168: referring form of “~S” must NOT occur at the top level ?

You can fix this error in Oracle by following the below steps

Action: Move the attributeGroup definition to within a complex type definition or an attribute group definition. Or, move the group definition to within a complex type, restriction, extension, choice, or sequence.