Integration Manager - Accounts Payable Distribution Reference Field

Hi,

i'm completely new to GP, and just started playing around with our Company Test data.  I created a new Integration, but can't seem to figure out how to change the Accounts Payable Distribution Reference Field to what i have set in the source file.  Is it even possible to modify this field for accounts payable? Or is there a way to copy the distribution fields from the other entries (i want all the distribution reference fields to be the same).

Using GP 2010 with Integration Manager 11

Thanks in advance.  Sorry if the terms i used are incorrect.