Mapping Custom Fields

Mapping Custom Fields

I am trying to map custom fields to autofill data when converting from a quote to Sales Order to Invoice.  When I go into the Setup ---> Quote ---->Fields List ----> Map Custom Fields all of my fields are mapped the way I want them (For Instance Scope of Work (Internal 1) Should autofill the same data after each conversion) but when I convert it these fields are blank and do not have the information I need.  What am I doing wrong and does anyone know how I can fix this?