I have the below stated table definition:
I want the field f_building_complex to be either NULL or to be referenced 
to the t_building_complexes.
Thus I have added the requires=......
But now the sqlform displays a text box instead of a dropdown. What to do?
Thanks


db.define_table('t_addresses',
    Field('f_street', type='reference t_streets',
          label=T('Street')),
    Field('f_building_complex', type='reference 
t_building_complexes',requires = 
[IS_NULL_OR(IS_IN_DB(db,db.t_building_complexes))],
          label=T('Building Complex')),
    Field('f_streetno', type='string',
          label=T('Streetno')),
    Field('f_block', type='string',
          label=T('Block')),
    Field('f_unitno', type='string',
          label=T('Unitno')),
    Field('f_latitude', type='decimal(10,8)',
          label=T('Latitude')),
    Field('f_longitude', type='decimal(11,8)',
          label=T('Longitude')),
    auth.signature,
    format='%(f_street_streets)s',
    migrate=settings.migrate)

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