# Limitations and Issues

1. The `<FunctionImport>` and `<NavigationProperty>` metadata tags are parsed, but their contents is not currently written to the metadata module.

1. When calling some of the entity sets in the demo OData service `GWSAMPLE_BASIC`, certain XML properties are returned whose values are not valid XML.
   Consequently, when `quick_xml` attempts to parse such values, it simply throws its toys out the pram and doesn't want to play anymore.

   If you encounter such errors, the raw XML string must first be sanitised before attempting to parse it.

   This functionality is described in the [README of `parse-sap-odata-demo`](https://github.com/ChrisWhealy/parse-sap-odata-demo).