please try :
db.define_table('place_info', 
*    Field('place_id', 'reference place', requires = IS_IN_DB(db, 
db.place.id, db.place._format) ),*
    Field('category_id', 'reference category'),
    Field('specific_desc', 'text'),
    Field('picture', 'upload'),
    format = '%(place_id)s'
    )

or

db.define_table('place_info', 
*    Field('place_id', 'reference place', requires = IS_IN_DB(db, 
db.place.id, '%(name)s') ),*
    Field('category_id', 'reference category'),
    Field('specific_desc', 'text'),
    Field('picture', 'upload'),
    format = '%(place_id)s'
    )

best regards,
stifan

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