This is working fine for me.

db.define_table('fruit', 
    Field('name'),
)


db.define_table('cocktail', 
    Field('fruit','list:reference fruit'),
)


from plugin_multiselect_widget import (
    hmultiselect_widget, vmultiselect_widget,
    rhmultiselect_widget, rvmultiselect_widget,
)


db.cocktail.fruit.requires=IS_EMPTY_OR(IS_IN_DB(db,'fruit.id','%(name)s',
multiple=True))
db.cocktail.fruit.widget = hmultiselect_widget

I just put that in the models with the plugin in the modules folder, then I 
inserted some fruit and cocktails in appadmin. Everything worked correctly. 
This is basically the same thing you're doing right?  
  
Can you open the console and check for javascript errors?


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