What is the accounting treatment for the below mentioned situation?

BSL Limited is a construction company in Hong Kong and involved with several situations which listed below that possibly involve contingencies. Its financial year ends 31 March, and the 2019 financial statements are issued on 16 May 2019.

In order to attract more customers, guarantees were given by BSL Ltd to certain banks in respect of performance bonds in favour of certain contract customers amounted to HK$122 million. There is no evidence for default payment from the customers.