xsd:unsignedByte proxy lost 0

Hi.

I have a problem with fields of xsd:unsignedByte type in sync proxy. I get request, that have fields, but then (in proxy) they

When i check my proxy in Original Response tab i see fields:

for example:

<TRUSTCONNECTIONREQUESTMETADATA>

<TRUSTCONNECTIONREQUESTSTATUS>0</TRUSTCONNECTIONREQUESTSTATUS>

</TRUSTCONNECTIONREQUESTMETADATA>

But in Response tab i don't see them.

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PS. I have sync abap proxy. ERP - PI - NonSAP - PI - ERP scenario.

I checked xml schema (response xml and function module structures) - it is fine.

Maybe it is only in test proxy tool?