[GNC-dev] Python Binding: GncOwner fails to convert from C->Python->C

I get a Python GncOwner object returned to Python. It appears well
formed.

owner:  <class 'gnucash.gnucash_core.GncOwner'> <gnucash.gnucash_core.GncOwner object at 0x7f33d4cc3050>
owner_instance:  <class 'tuple'> (4, <Swig Object of type 'GncVendor *' at 0x7f214b5a9500>)

It's not clear how to easily inspect the Swig object.

However, the object doesn't convert back to C. It's not recognized as
GncVendor.

I get:

ValueError: Python object passed to function with GncOwner * argument couldn't be converted back to pointer of that type

The out typemap for GncOwner looks correct. However, I can't see how
the in typemap gets the swig wrapper object from the tuple created by
the out typemap. 
 
I can recreate the problem in simple_business_create.py with the
attached patch.

If there is nothing obviously wrong with the typemaps, how should I go
about debugging this?

Thanks,
Steve

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diff --git a/bindings/python/example_scripts/simple_business_create.py b/bindings/python/example_scripts/simple_business_create.py
index 029a4f530..2b7e4d1c4 100644
--- a/bindings/python/example_scripts/simple_business_create.py
+++ b/bindings/python/example_scripts/simple_business_create.py
@@ -134,6 +134,11 @@ try:
 
     invoice_customer = Invoice(book, "5", CAD, new_customer)
     customer_extract = invoice_customer.GetOwner()
+    print('customer_extract: ', type(customer_extract), customer_extract)
+    owner = customer_extract.GetEndOwner()
+    print('owner: ', type(owner), owner, owner.get_instance())
+    addr = owner.GetAddr()
+    print('addr: ', type(addr))
     assert( isinstance(customer_extract, Customer) )
     assert( customer_extract.GetName() == new_customer.GetName() )