How to exclude a value in multiple selection of characteristic values of a Block Basis Definition?

Dear Experts!

Is there a way to exclude a value in multiple selection of characteristic values of a Block Basis Definition?

Here is where I need this:

You define Block Basis Definitions in t-code /SAPAPO/MC01_BBD:

1. You specify the class and click on button "Change" or press F6

2. You create a new line or select an existing one to modify

3. You click on button "Detail"

4. You click on button "Multiple selection" of the characteristic values field

5. You enter the value of the characteristic

At this point I am only able to enter values to be selected - I cannot - or don't see an option to use an operator "not equal" like for example in /SAPAPO/RES01 when selecting resources.