Recently created SLA is not calculating

Document ID : KB000107644
Last Modified Date : 23/07/2018
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All the SLOs of this newly created weekly SLA are failing to calculate. They all displaying as a light blue icon, not the usual red or green which indicates calculation is occurring.
- UIM 8.5.1
- sla_engine 8.52
Operating periods defined for SLOs using 24:00 instead of 23:59 (Known issue to be fixed in UIM 9.0)
Edit any/all defined operating periods anywhere they are specified as 24:00, to 23:59 and then recalculate the SLOs.
In a few minutes they should change color from blue to the correct status, e.g., red/green.