Elements with ref attribute

Hi,

Assuming the code that follows:

```xml

```

I am getting an error:
```
[ERROR] Error while parsing schema(s).Location [ jaxb.xjb{21,38}].
com.sun.istack.SAXParseException2; systemId: jaxb.xjb; lineNumber: 21; columnNumber: 38; compiler was unable to honor this as-element-property customization. It is attached to a wrong place, or its inconsistent with other bindings.
```

I would like to know if there is any known issue with the attribute **ref** or if there is something I am missing. I have already tried placing it at different locations in the path.

A similar approach works for:

```xml

```

**Note:** I cannot change the xsd file.

Thank you for your time.

Kind regards,
Francisco