definition of Service Target (form's name is SLM:ServiceTarget, can also be accessed from Service Level Management Console -- either by clicking on Applications ==> Service Level Management ==> Service Level Management Console, or by directly accessing form SLM:Console) includes associated Business Entity (tab <Goal and Cost>, under Business Schedules) used to determine what should be considered as business hours in context of particular SLA.
Documentation for BMC Service Level Management 18.08 is available at https://docs.bmc.com/docs/slm1808/home-821937226.html .
This is now solved. I'd like to share what our resolution was. Since we already built the SLAs (the issue was that they were calculating 24/7), all we needed to do was:
1. Create a Business Time Entity
2. Create Business Time Segments. In our case, we had 4 segments: Available Mon-Fri 9am-5pm, Unavailable Daily 12am-9am, Unavailable Daily 5pm-11:59pm, and Unavailable Sat-Sun 9am-5pm.
3. Relate the time segments created in #2
If there were any incidents using those service targets before Business Entity was set, they may need update of any one of attributes used in Terms and Conditions -- first an update to some value not used for that (or any) service target in order to detach them, then an update to previous value in order to reattach modified service targets -- to have Business Entity applied to measurements. (This should be undertaken carefully because service target can be set up either to include previous state, or to start from scratch.)