Sample code for listing a FixedPriceItem with ebay

finally ebay answer to the question and solve the problem.

The call was failing because the mandatory ItemSpecifics Brand(Marca for Italy site) & MPN was missing. It'll work fine if you use the following parameters.

<ItemSpecifics>
  <NameValueList> 
    <Name>Marca</Name>
    <Value>TEST</Value>
  </NameValueList>
  <NameValueList>
    <Name>MPN</Name>
    <Value>00000</Value>
  </NameValueList>
</ItemSpecifics> 

The problem was about the name of the variable , for the italian site the name of the variable "Brand" is "Marca" ...

so for python dictionary in the request:

"ItemSpecifics": {
                    "NameValueList": [
                        {"Name": "Marca",
                         "Value": "TEST"},
                        {"Name": "MPN",
                         "Value": "0000"}
                    ]
                  }

The ebay support team at the moment doesn't have an expert in python but if you can provide the xml for the request they can help. To obtain the real XML with a python sdk you can include in the connection debug = true, example below:

t = Connection(config_file='ebay.yaml',debug=False)

Thanks to everybody for the support.