How to put a default value in Compensation Plan ?

Summary:

I have a request from a client which is to have only a default value displays whereas a list of value in which it can have a blank from this list.

In fact from the compensation plan, this column is blank by default. My client is asking for doing the modification inside the configuration.

Content (required):

From the Compensation plan, the client from the display worksheet wants to have only the default value display No and not something else.

There is a column named "Promotion". The needs is to have only the default value No which displays from the Compensation Plan.