"Offset" for creating profiles for the L26500 on Flexi

Hello, First, guys, sorry for my English. I will try to explain my problem I have some problems when trying to create new profiles for my media. We using Flexi 12, and before printing color calibration pattern I can choose print and scan option or only print. When I chose print and scan automatically, it sometimes works fine, sometimes just canceling. When I trying scan already printed pattern, Flexi asks to specify offset (X Y axes) for the first color. How did I need to measure offset? From the media corner? Or from the black bars on the edges of the table? And I need the make measure to the middle of the color bar? Can't find any information in google