Having been asked to make some changes in a BADI, I was confronted by SAP Standard Structure MDG_BS_BP_S_EXTERN which is a structure made of lots of other structures. I'd been asked to make changes to content of a field, but it wasn't obvious where in the multi-structure environment the field resided.
One option was to methodically go through all the structures looking for the relevant one. I thought there must be a way to explode this...
and so function module CATSXT_GET_DDIC_FIELDINFO...
Takes input of MDG_BS_BP_S_EXTERN (which, if you look at in SE11 just has some structures:)
And explodes to the more realistic 1.6k ish fields:
