According to PMI's best practices, a project manager should communicate any discrepancies found in the project charter, especially those related to the budget, as soon as possible. It is crucial to address these issues early on to avoid future risks and to ensure that the project has all the necessary resources for successful completion. The project manager should not start the project with known gaps in the budget or reduce the quality of deliverables to compensate for budgeting errors. References: PMI's A Guide to the Project Management Body of Knowledge (PMBOKGuide) - Sixth Edition.