Multiselect Combobox eror

Hi Agusecc,
You are seeing the error message because you're using the multiselect combobox incorrectly.
The mutliselect combobox is used when searching a tablegrid.  It allows you to select multiple values from a combobox rather than doing iindividual searches.  In the screenshot in the attachment, you can see how the user can search for multiple nationalities. 
But when you edit the record, you can't hold a multiselect value against that record, you can only hold one value.  If you use the mutiselect feature and try to save it, you'll get an error.
If, as in your example, you want to hold multiple values against a person (singer, dancer), then you should amend your data structure and add a new table ('activity' for example, that contains 'singer', 'dancer' etc etc) and create a many:one relationship to the relevant table.
Derek.