Adding drop downs (selection lists) to user registration page Plone - plone

Question

My problem & fixing attempts
I have a Plone 4 site which I have used collective.examples.userdata on in order to register new custom fields on the registration form and ##personal-information page. One of my fields needs to be a selection list allowing the user to specify which team from the organisation they are in.
I have successfully got the selection list appearing on the registration form and ##personal-information forms, however I am falling flat when trying to figure out how to add it to the mysite.com/portal_memberdata page.
I have tried adding a field to this page with the following information:
Name: team
Type: selection
Value: getTeamValue
getTeamValue is a Python script that contains:
return ('(nothing selected)','Volunteers','Trustees',
'Quality, Education & Learning','Bereavement Support',
'Supportive Care Services','Hospice at Home',
'Day Services','Medical Team','Inpatient Unit'
,'HR','Support Services','Accounts & IT',
'Communications','Trading','Fundraising')
Now when I alter the drop down lists value and try to save the changes, (on ##personal-information) I get the following traceback:
Traceback (innermost last):
Module ZPublisher.Publish, line 126, in publish
Module ZPublisher.mapply, line 77, in mapply
Module ZPublisher.Publish, line 46, in call_object
Module zope.formlib.form, line 795, in __call__
Module five.formlib.formbase, line 50, in update
Module zope.formlib.form, line 776, in update
Module zope.formlib.form, line 620, in success
Module plone.app.users.browser.account, line 64, in handle_edit_action
Module zope.formlib.form, line 543, in applyChanges
Module zope.formlib.form, line 538, in applyData
Module zope.schema._bootstrapfields, line 227, in set
Module kcs.userdata.adapter, line 20, in set_team
Module Products.PlonePAS.tools.memberdata, line 261, in setMemberProperties
Module Products.PlonePAS.sheet, line 75, in setProperty
Module Products.PlonePAS.sheet, line 72, in validateProperty
PropertyValueError: Invalid value (Volunteers) for property 'team' of type lines
I have also tried setting the Value field to both lines and string, but both result in the same traceback, however the bottom line's lines word is replaced for string or selection etc.
Code used
These are the excerpts of code I use in my add-on to add the selection box to the user registration:
adapter.py
def get_team(self):
return self.context.getProperty('team','')
def set_team(self, value):
return self.context.setMemberProperties({'team': value})
team = property(get_team, set_team)
userdataschema.py
team = schema.Choice(
title=_(u'label_team', default=u'Select your team'),
description=_(u'help_team', default=u"Select your team from the list below"),
values = [
_(u'Volunteers'),
_(u'Trustees'),
_(u'Quality, Education & Learning'),
_(u'Bereavement Support'),
_(u'Supportive Care Services'),
_(u'Hospice at Home'),
_(u'Day Services'),
_(u'Medical Team'),
_(u'Inpatient Unit'),
_(u'HR'),
_(u'Support Services'),
_(u'Accounts & IT'),
_(u'Communications'),
_(u'Trading'),
_(u'Fundraising')
],
required=True,
)
memberdata_properties.xml
<?xml version="1.0"?>
<object name="portal_memberdata" meta_type="Plone Memberdata Tool">
<property name="position" type="string"></property>
<property name="linkedin" type="string"></property>
<property name="team" type="choice"></property>
<property name="accept" type="boolean"></property>
</object>
propertiestool.xml
<?xml version="1.0"?>
<object name="portal_properties" meta_type="Plone Properties Tool">
<object name="site_properties" meta_type="Plone Property Sheet">
<property name="user_registration_fields" type="lines">
<element value="position" />
<element value="linkedin" />
<element value="team" />
<element value="accept" />
</property>
</object>
</object>
Let me know if I need to provide more information and any thoughts would be greatly appreciated.