Invalid or no mapping to system data types found

Hi,

Has anyone came across this error message?

I'm trying to call a media gateway service. ST22 and /iwfnd/error_log don't show any errors.

<errorxmlns="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata">

• <code>005056A509B11EE1B9A8F9659103578A</code>
• <messagexml:lang="nl">Invalid or no mapping to system data types found</message>

</error>

Thanks,

R.W.