Error in field with boolean

You posted something different in your question than what was in your XML.

But neither looks correct. It should be:

<unis:CrearDomicilio xsi:nil="true" />

And it would be good to define the xsi namespace, as:

<soapenv:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:unis="http://unisolutions.com.ar/">
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