Please see below links and comment back if your doubt still not cleared 🙂
What exactly do we mean by ASSERTION LEVEL? You mentioned that risk is identified @ assertion level. For instance, assertion for Fixed asset i.e. its existence, completeness, etc, how can it be identified while seeing FST? you also said that if there is high risks involved in these features, we will be careful about those while conducting audit. But how can we know whether there is high risk of misstatement in such assertions, just by seeing FST?