D365 Retail POS: Viewing detailed error information

When closing a transaction your Retail POS gives error "Required value is missing".

Error is quite generic but if you RDP to the Retail Server >>> Windows Event Log >>> Application and Services Log >>> Microsoft >>> Dynamics >>> Commerce-RetailServer >>> Operational you will get more details about the exception. In this case the error was that my pick up warehouse did not have an address specified. 

See the screenshot below for more visual information.