When a project team is struggling to obtain the required data, it is essential for the project manager to directly address the issue with the data suppliers. By meeting with the suppliers, the project manager can clarify the critical timing requirements and the importance of the data for the project's next stage. This proactive approach is in line with the PMBOKGuide's emphasis on stakeholder engagement and communication management as key aspects of project management123.
References: = PMBOKGuide and Standards foundational documents; Professional in Business Analysis (PMI-PBA) reference materials.