If your Sage Pastel asks to Specify the Login information
Disable the Use Enhanced Search for Customers, Suppliers and Inventory feature by going to Setup | Users / Passwords | Users for the company that you are getting a problem on.
On the screen that opens, select the username who gets the error and click on User Preferences, next deselect Use Enhanced Search under Customers, Suppliers and Inventory, then click OK and OK again to save the changes.