If you want to set a specific load order for Report Type to determine the sort order by using sort option 'load order', all you have to do is use the INLINE LOAD before you are loading your Report Type fields in any other table LOAD.
I assume you have another table with Report Type, Case ID and Case Date, so just do this:
LOAD * INLINE [
LOAD [Case ID],
DROP TABLE Dummy;
You are welcome.
Just remember that load order is determined by the first appearance of a field value during your script execution.
And that we are talking about field values, not table records, so if your field is a key field (like in the sample above) both table loads need to be considered to determine the load order (that's what we benefit from when using an INLINE LOAD first in the script).