Problem:
document.save() throws "Object is not scriptable exception" when fetching values from virtual doc.
Root cause:
```python
# ....
if frappe.get_meta(doctype).get("is_virtual"):
values = frappe.get_doc(doctype, docname) <--- Document is not scriptable.
.as_dict()
# ....
def set_fetch_from_value(self, doctype, df, values):
fetch_from_fieldname = df.fetch_from.split(".")[-1]
value = values[fetch_from_fieldname] <--- Tries to access value by key and throws "Object is not scriptable" exception
```
Solution:
```python
if frappe.get_meta(doctype).get("is_virtual"):
values = frappe.get_doc(doctype, docname).as_dict() <--- Makes the document scriptable.
```
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