Problem with a saved search of the type Revenue Recognition Schedule

:h_a_w:

I have created a saved search of the type Revenue Recognition Schedule (recrecschedule). It's public and work fine executed in the GUI.

When I try to do a search in my saved search from my scheduled script I get the error "That search or mass update does not exist."

Here is my code:

 var searchresults = nlapiSearchRecord('revrecschedule', 'customsearch_week_stat_2', null, null);   

If I try to search directly against the record type like below, everything works as expected - no error.

 var searchresults = nlapiSearchRecord('revrecschedule', null, null, null);   

I have tried to do a search against other saved searches of other rec types without any problem.