Can I add a static field to an export template?

SOLVED

Hi guys,

I am trying to build an export to CSV that we can upload to the bank on a daily basis.  I'm nearly there, I'm creating a 'flat' format export, and it's all looking good, though the bank requires one of the fields to be a single character that never changes. This field doesn't exist in X3. Can I add this to the export template easily, or do I need to do something clever?

Thanks in advance for your help.

Jim