Hello,
I have installed Odoo Point Of Sale and change default currency in (Settings->Companies->My Company) to LYD.

here... the POS session wantn't to start and the following message pop-up when click on Start Session button!!!

"All available pricelists must be in the same currency as the company or as the Sales Journal set on this point of sale if you use the Accounting application."

However, when I'm reset the default currency to USD, all things works fine.

I didn't install (Accounting application), I just Install (Point of Sale application) which required (Inventory and Invoicing applications)