No existing surface found - Cut/Fill volume

Hi there,

I am having problems when using the Cut/Fill volume function. I imported a terrain file (DTM file) with the feature definition as Existing, then import an XML file with the feature definition as Design. But when I want to create cut and fill volume the program it is showin "no existing surface found".

Someone knows why it could be this?  

->  I´m using OpenRoads Designer CE - 2021 Release 1 Update 10 Version 10.10.01.03

Thanks in advance,