According to the PMBOKGuide, the issue log is a project document that records and tracks the issues that arise during a project and how they are resolved1. The change log is a project document that records all the changes that occur during a project, including their status, description, and impact2. The project manager should update these two documents as soon as possible to reflect the invoices with errors and the actions taken to correct them. The risk register is a project document that identifies and analyzes the project risks and their responses3, but it does not record the issues that have already occurred. The stakeholder register is a project document that identifies and classifies the project stakeholders and their requirements4, but it does not record the issues or changes that affect them. The backlog register is not a standard project document, but it may be used in agile projects to list the product features or user stories that need to be delivered, but it does not record the issues or changes that affect the product quality. References: 1: PMBOKGuide, page 123; 2: PMBOK Guide, page 122; 3: PMBOKGuide, page 436; 4: PMBOKGuide, page 513; : Agile Practice Guide, page
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