-20409 AN XML DOCUMENT OR CONSTRUCTED XML VALUE CONTAINS A COMBINATION OF XML NODES THAT CAUSES AN INTERNAL IDENTIFIER LIMIT TO BE EXCEEDED

Explanation
 An internal identifier that must be associated
with each XML node of an XML value cannot be generated because the
combination of the number of levels of XML nodes and the number of
children nodes within these levels causes the identifier to overflow.

System action
 The statement cannot be processed.

Programmer response
 For a document or constructed XML value,
reduce the number of levels of XML nodes or the number of children
nodes especially at the deeper levels of XML nodes.

SQLSTATE
 560CG