Understanding & debugging SLA issue could be time consuming. I have prepared below matrix which can ease out understanding how an SLA record is attached to a task. It is import to understand the precedence of condition evaluation in designing conditions for SLA's

STOP>>PAUSE>>START. This is the sequence in which SLA engine evaluates the conditions to take appropriate action for SLA.

Please note that this chart assumes "When to Cancel & When to Resume" conditions being kept as default i.e Start conditions are not met & Pause conditions are not met