What is the standards or measures to list a specific liability into contingent liabilities at annual Balance sheet ?

Recognition of Contingent liability if, and only if, all of the following criterias are meet:

a) A present obligation (legal or constructive) has arisen as a result of past event,

b) Payment is probable (more than20% probabilty, less than or equal to20% needs to be disclosed in notes),

c) Payment can be estimated reliably.

IAS37