To set default values in OpenERP:

1) Activate Developer Mode.

2) Open a document (Product, Customer, Order, etc) and change the value to what you want the default to be:

Note: You don't have to save your changes.

3) From the Debug menu dropdown, choose Set Defaults.

4) Choose the field you wish to set a default value for, specify if this affects just you or all users, then click Save default:

Note: Repeat this process if you want multiple defaults for a form.

5) All newly created documents (records) will now show this field set to the default value (this includes data that is imported). Users are still able to change the default to another value.

Note: This does not change the value of any existing records.