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

[Steve Brown]

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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