According to IFRS 15, an entity should recognize revenues by applying the following steps: 1. Identify the contract(s) with a customer; 2. Identify the performance obligations in the contract; 3. Determine the transaction price; 4. Allocate the transaction price to the performance obligations in the contract; 5. Recognize revenue when (or as) the entity satisfies a performance obligation. Which step is most likely to cause recognition issues?