How to change default value in a drop down which uses a lookup?

Hi,

We are using a lookup called 'TERMS DATE BASIS'. For this lookup we have two values defined, where upon creation of a supplier one of the values are defaulted. Now we want to change the default value to the other value.

However, we are not able to find how to do this. When clicking the 'Personalization'-link no option is given as to how to set the default value.

From the database we are not able to localize where this lookup is being used, the field in the GUI is called 'Terms date basis' and it is available under the 'Key Payment Setup' in the 'Quick update'. But we cannot find anyway to change this.