Pick up changed data on custom delivery address field

Hi. We are using SRM 7.02 and I've added some custom fields to the delivery address tab on the shopping cart, webdynpro /SAPSRM/WDC_UI_DO_SHIPTO. I added custom fields into the view context and bound them.

I'm handling the data in method enhancements and moving it to where I want it stored and it works fine to a point.

The only issue is that if the user changes these custom fields then presses the "check" button, the new data is not picked up by any of the BADI's (doc check etc).

Changing a standard field on the same screen is picked up by the BADI's.

I can not see any difference between the standard and custom fields in this regard. The method I am using moves the data into standard fields and ultimately stores fine, but I need to be able to get the new data into the BADI's.

Any ideas?

Regards,
Dave.