DataSourceField with valueMap and "required:false" can't be edited to be empty

[gho421]

Version:
SmartClient_v83p_2013-03-20

Example (w/o DataSource but same behaviour):

isc.FormLayout.create({
    items:[
        {
            name: "you",
            type: "text",
            title: "Choose value",
            valueMap:["A","B","C"],
            required:false
        }
    ]
})

The item is displayed as drop-down list. After you have selected a value you can't set the field empty again. I would expect, that this should be possible on fields with required set to false?

It's only a testcase example. In my real app it's a DataSourceField with a valueMap from a ResultSet (and I don't want to inject a "void value" into this map as workaround) displayed by a DynamicForm.

[Isomorphic]

Set allowEmptyValue:true.

[gho421]

Works. But if the field is initially empty in a record, the resulting SelectList contains two empty entries?

DataSource field definition:

	    {name:"PART_UFOR_ID", type:"intEnum", title:"Unternehmensform", detail:true,
		    valueMap:window.dsUforLUData.getValueMap("UFOR_ID","UFOR_DISPLAY"),
		    allowEmptyValue:true
	    },

[Isomorphic]

That would only happen if you provided a value that rendered as empty (due to valueMap or displayField) but the value itself was not null.

[gho421]

The empty value was delivered to RestDataSource as ...

<PART_UFOR_ID></PART_UFOR_ID>

How to get it more empty?

Checked behaviour with IE8 and Chrome 25.

[Isomorphic]

Omit it entirely.

[gho421]

Works and even solved another problem.