Opc Ua Enumerations and EnumValueType|OPC UA Standard|Forum|OPC Foundation

Hello Experts

I have a vendor of an Opc Ua Server that is currently showing the following example values when reading the Value attribute of an enumerated Node Variable from an Opc Ua Client.

Value : EnumValueType
    Value : 7
    DisplayName : RUNNING
    Description : 

My understanding of enumerations is that only an int32 should be returned as the value attribute and not the datatype EnumValueType.

This is causing issues as another vendor's opc ua client is not able to read the EnumValueType and returns a read error.

When questioned, the vendor using EnumValueType stated that 3rd party opc ua clients need to be able to read EnumValueType correctly.

Is it permissible to use EnumValueType as the datatype for enumerated node variables or other node variables within Opc Ua Standard?