FBL3n - Add new fields

Hi,

In FBL3n when I drill-down on the line I can see the following 3 documents:

When you click on the reporting document you see fields from table AFRUD, is there anyway to add these fields into the line item display of FBL3n? I have checked the special fields within SPRO-GL section but you cannot add any fields from this table.

thanks for your help in advance.

Joe