C/C++ API Remote Server Error: MR-UNDEFINED_ACCESSOR?

Hi,

When I try to get the values of some attributes in Smarts I'm getting the remote server error MR-UNDEFINED_ACCESSOR.

I'm using the following method:
// returns error code 314646 (Remote Server Error)
error = sm_get(&handle, "Host", "SMARTS", "IsProxyDown", &value);

This happens with all attributes that appear to have null values (attributes that show in italics gray out in the domain manager administration console).

Does anyone has seen this behavior before? Is there any way to handle it?
Where can I find documentation about the remote server errors that might return the API?

For example, the domain manager console grays out this attributes, and I was wondering if there is a method in the API that helps to find out this attributes instead of calling sm_get an parsing the error message to determine if this particular error has happened.

The complete error message is:

CI-E-EGENERIC-At
U:/FOUNDATION-7.0/73/smarts/repos/mr/acc_interface_user_defined.c:292
this is a history only accessor: Called an undefined method on an accessor
MR-UNDEFINED_ACCESSOR-Called an undefined method on an accesso


Any lights on this will be highly appreciated.

Thanks!