DMProcessConfigXML API returns error code E_INVALIDARG

Hi,

When i am trying to set PreferredConnections using DMProcessConfigXML API for a GPRS connection. It returns the standard error code E_INVALIDARG.Can any one tell me why this is happenning? and what does it mean?.

WAP provisioning xml i passed into DMProcessConfigXML function is

<wap-provisioningdoc><characteristic type="CM_Planner">
<characteristic type="PreferredConnections">
<parm name="{8928DE37-C914-4db4-90E9-C5213E475A77}" value="MyGPRS"/>
</characteristic>
<parm name="FailoverPrompt" value="1"/>
<parm name="FailoverDefault" value="1"/>
<parm name="CacheTime" value="60"/>
<parm name="RetryCount" value="1"/>
</characteristic></wap-provisioningdoc>

and the out put xml return by DMProcessConfigXML function is

<wap-provisioningdoc><characteristic type="CM_Planner">
<characteristic type="PreferredConnections">
<parm name="{8928DE37-C914-4db4-90E9-C5213E475A77}" value="MyGPRS"/>
</characteristic>
<parm-error name="FailoverPrompt" value="1"/><parm name="FailoverDefault" value="1"/>
<parm name="CacheTime" value="60"/>
<parm name="RetryCount" value="1"/>
</characteristic></wap-provisioningdoc>


Here i can see the 'FailoverPrompt' parameter is failing. Why this is happening?

Thankful to you any kind of help.
Mohamed Shakir