Purchase Order - You do not have a license to use this product

Hi,

We have created a test environment on a standalone PC to test the upgrade of Sage 300 Premium Edition 2018 version with PU1.

Everything is working fine except:

we get an error popping up (picture attached) on clicking any icon of Purchase Order Module. However, if we access the same Purchase Order icons through Visual Process Flow, windows are opening without and everything is working without any problem. All other modules are also working fine but issue with only Purchase Order Module.

What should I look into to fix this problem?

Many thanks in advance

Talal