Solution
Entity A has at least two performance obligations in this contract:
However, the constant alterations and assessments during the construction phase might result in the design and construction phases being considered a single performance obligation if the design is significantly modified throughout the construction process. This is because under IFRS 15, a good or service is distinct if the entity's promise to transfer the good or service to the customer is separately identifiable from other promises in the contract. In this case, if the design and construction phases are highly interrelated and the design cannot be separated from the construction, they would be considered as a single performance obligation.
Therefore, it will depend on the exact facts and circumstances, particularly the extent to which the design is modified during construction, whether Entity A has two or only one performance obligation