When I display a grid of the table 'station_analysis_parameters' and edit 
either 'common_params_preset_file' or 'reference analysis_presets'  a 
dropdown list with the rows from analysis_presets.filename' appears 
but choosing and entry from this list  and clicking submit does not do save 
anything the two reference fields remain 0? All the other fields in the 
table work.  Anybody see what I am doing wrong?

db3 = DAL('sqlite://autoflowForms.sqlite')
db3.define_table('analysis_presets',
    Field('filename'))
db3.define_table('sample_ids',
    Field('sample_id'))
db3.define_table('station_analysis_parameters',
    Field('common_params_preset_file', 'reference analysis_presets', 
requires=IS_IN_DB(db3, 'analysis_presets.filename')),
    Field('operator', requires=[IS_NOT_EMPTY(), IS_ALPHANUMERIC()]),
    Field('gasport', requires=IS_IN_SET(['1', '2', '3'])),
    Field('enable', type='boolean'),
    Field('station_preset_file', 'reference analysis_presets', 
requires=IS_IN_DB(db3, 'analysis_presets.filename')),
    Field('weight', type='double',requires=[IS_NOT_EMPTY(), 
IS_FLOAT_IN_RANGE(1e-2, 1e2)]),
    Field('sample_id',requires=[IS_NOT_EMPTY(), IS_ALPHANUMERIC()]),
    Field('description', type='text'))

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