Subtraction within Main Query and Sub Query not possible
I have created a report which selects one value in the main table and then I am selecting another value with a Sub query from another table.
Then I want to create a deviation between those two fields but I am not able.
After I have choosen one field I can not choose the second one from the Sub Query.
Is there a possibility to add a Deviation but not a percentage?
Thank you so much for your help.