[VKS]

When you use Ext JS’s ComboBox, if you don’t set hidden name or id, it send display field value, not value field. To handle this, it has to be set. Be careful about uniqueness of the hidden name, for more details you can check Ext JS ComboBox’s documantation

var unitField = new Ext.form.ComboBox({
    id:'unitField',
    name: 'unit',
    fieldLabel: 'Unit',
    store:unitStore,
    mode: 'remote',
    displayField: 'name',
    valueField: 'id',
    hiddenName : 'unitId',
    allowBlank: false,
    anchor:'95%',
    triggerAction: 'all'
});