Sending Attachment with SoapUI

I need to send a Webservice Request with an attached file. I set the "enable Inline Files" property true and added the file as an attachment (type = "CONTENT", Part = "VHDL61_DWLG_110600.txt"). In the request I inserted the following element:

<dateiInhalt>cid:VHDL61_DWLG_110600.txt</dateiInhalt>

But when I send the request and lokk into the raw request i see that the request gets cut of after the file content. When I use anonymous as Part the cid doesn't get replaced.

Does anybody know where the problem ist?

Thanks in advance...