Business Central and Jet Reports use the same table names because Jet Reports simply displays data from your Business Central database without modifying any table or field names.
It seems there may be some confusion between Business Central Pages and Tables. For instance, in Business Central, the page is called Posted Purchase Invoice Lines, but the underlying table is actually Purch. Inv. Line.
Hope this blog post clarifies the difference pages and tables in Business Central - How to Identify Business Central Page, Table, & Report Object Numbers - Dynamics 365 Business Central Insights
Valentin Castravet
Work: Zander ERP Services
Blog: Dynamics 365 Business Central Insights
LinkedIn: www.linkedin.com/in/valentin-c-0500a247/