If you specify more than one validator,  e.g.
[IS_NOT_EMPTY(), IS_IN_DB()]
then you suppress the drop-down.  From memory, you can simply re-specify 
the multiple widget with .widget

In any case, this...
> I have workaround: IS_IN_DB(...., multiple=(1,9999999))
means you are asking to select at least one item,  which I think is what 
you want. 
So,  it isn't a workaround,  it is a good solution :)

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