<p dir="ltr" style="line-height: 1.38; margin-top: 12pt; margin-bottom: 12pt;">[size= 11pt; font-family: Arial,sans-serif; color: #000000; background-color: transparent; font-weight: 400; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap]Power BI supports multiple data sources, but integrating them into a unified model can be complex. Developers face issues such as inconsistent data schemas, varying refresh rates, and performance bottlenecks when connecting to live data sources using DirectQuery. Combining real-time and static data sources can require advanced configurations and often results in slower performance. Additionally, data transformation capabilities within Power BI, while robust, may be insufficient for complex scenarios, necessitating external ETL tools. This adds to the project&rsquo;s overall cost and complexity, making seamless multi-source integration a significant limitation of Power BI development services.[/size]