Yes, Purchase Order Details tab has columns that identify the linked Sales Order. If you don’t see these fields, click circled item, for Column Configurator, and choose these two fields onto your grid:

@charithalakshan49  In addition to the above comment Laura, we can also see the SO and PO relations on both screens (Sales Orders and Purchase Orders). Please find the screenshots for reference.

@laura01 @Naveen Boga  Thank You very much for the help!