Hi,
In WE42 Initially we had the function module BORES_IDOC_INPUT_DESADV1 which is wrong hence I had changed the function module to IDOC_INPUT_DESADV1.
I had tried to find the Customer exit by putting break point in customer function and by using package(SMOD) etc ..but could not get a useful Enhancement.
Kindly let me know if there is any exit That can be used to update custom fields.
Thanks.