Using SOAP API: How to differentiate SFDC leads from SFDC contacts?

[Grégoire_Miche2]

In your specific non working case, are you using an email or an ID to retrieve the lead?

[Anonymous]

I'm using lead ID

[Grégoire_Miche2]

So no risk of hitting a duplicate.

I fear it will take a support ticket at this stage.

-Greg