customizing to do billing using free of charge delivery type
I have the following task to do in urgent.
Usually in free of charge delivery, billing is not needed,
but my task is I have to make customizations so that
billing should be needed(have to do billing).when selcting free of charge delivery type.
Flow is like this
Free of charge delivery->delivery->billing
Please let me know the customizing to do......
Thanks in advance...........