Hi, I'm attempting to setup custom SLAs for one of the teams in my organization and I'm attempting to have the SLA applied depending on the Category/Subcategory selected when the ticket is created.

If you look at the image above, this shows the subcategory New Client Number Setup (a member of the Implementations category) is selected. Unfortunately, the system will not allow me to apply the SLA from the business rule configuration, so I'm instead trying to assign within the SLA configuration screen. 

When attempting to apply the criteria to the SLA itself, I can select the appropriate category:

But the subcategories are missing: 

Could someone advise on how to correct this? The configuration of both the SLA and Business Rules were attempted using the Default Site settings, so I think it should be visible permissions-wise...