Can't nil out nullable 1 to 1 field

I have an object called a Ticket which has a one-to-one nullable relationship
to a Code_Release.  When I try to set the field in the ticket to nil, it
doesn't make that change in the database.  The funny think is that it's
happy to increment the version number but doesn't nil codeRelease.  Any
ideas?  I'm using the Glorp packaged with VisualWorks 7.10.1 with an Oracle
database.

Details:

Code to nil the code release:

	MyGlorpSession inUnitOfWorkDo: [:session |
		selectedCodeRelease tickets do: [:ticket |
			session register: ticket.
			ticket version: ticket version + 1.
			ticket codeRelease: nil]].


Ticket class model:
classModelForTicket: aClassModel
	aClassModel
		newAttributeNamed: #id;
		newAttributeNamed: #version;
		newAttributeNamed: #codeRelease type: TicketCodeRelease

Ticket mappings:
descriptorForTicket: aDescriptor
	| table |
	table := self tableNamed: 'TICKETS'.
	aDescriptor table: table.
	(aDescriptor newMapping: Glorp.DirectMapping) from: #id to: (table
fieldNamed: 'id_pk').
	(aDescriptor newMapping: Glorp.DirectMapping) from: #version to: (table
fieldNamed: 'version_lk').
	(aDescriptor newMapping: Glorp.OneToOneMapping)
		attributeName: #codeRelease;
		mappingCriteria: (
			Glorp.Join
				from: (table fieldNamed: 'code_release_fk')
				to: ((self tableNamed: 'CODE_RELEASES') fieldNamed: 'id_pk')).

Ticket table:
tableForTICKETS: aTable

	| codeReleaseField |
	(aTable createFieldNamed: 'id_pk' type: platform sequence) bePrimaryKey.
	(aTable createFieldNamed: 'version_lk' type: platform integer) beLockKey.
	(codeReleaseField := aTable createFieldNamed: 'code_release_fk' type:
platform integer) beNullable: true.
	aTable
		addForeignKeyFrom: codeReleaseField
		to: ((self tableNamed: 'CODE_RELEASES') fieldNamed: 'id_pk').

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