How to set contract document type field to default value

Hi All,

We are having recently upgraded CLM system. Version 9.017

While creating Master Agreement under Contract Document tab we have "Upload Document" option.

On clicking on Upload Document, New Contract Document screen is coming up with a drop down list for the field Contract Document Type.

I want to set a default value for Contract document type as we have only one type. Now it is giving dropdown list which contains "Select" and the doc type.

Please help me to set the default value.

Thanks in advance,

Unnikrishnan