SSP: How to default a Negotiated flag on Enter Requisition Line

Summary:

Hi,

On our test environment we have customized the “Enter requisition line” page to show the field “Negociated Flag” , and we have renamed it to “Automatique”.
We would like to have this field ticked by default, so we customized the field and set the Value = true

Now the field is automatically ticked when we enter the page, however when we create the requisition and query the requisition line , the value of the field “NEGOTIATED_BY_PREPARER_FLAG” is null.

Is there a way to set the value of this field as ticked by default , that is then saved in the requisition line ?