Use below.

<select class="input-sm form-control" select2="" ng-model="detail.Product"
    containercssclass="all" ng-options="c.PID as c.PName for c in detail.products">
    <option value="">Select Product</option>
</select>

Hi mahesh213,

You can't apply index for select. You have to use $index in option tag like below.

Refer below code.

<select class="input-sm form-control" select2="" ng-model="detail.Product"
        containercssclass="all">
    <option value="">Select Product</option>
    <option ng-repeat="p in detail.products track by $index" value="{{$index}}">
        {{p.PName}}
    </option>
</select>