Oracle Message LPX-00252 - invalid entity replacement-text nesting

ERROR	invalid entity replacement-text nesting
CAUSE	Markup included from an entity must nest/group properly. That is, open/close markup must occur within the same entity. For example, > ]> &e; Is invalid since foos start-tag occurs in the top-level document, but the close-tag is provided by the e entity. Both start and end must be provided by the same source.
ACTION	Examples, such as the ones above, are not permitted.