Contact Person (Z)Fields Properties in MDG customer

There are some ZZ-fields I added to the BP_CENTRL entity. Now I show these fields at Customer details as well as Contact Person Section. However fields properties must be different between Customer and it's Contact Person. I differ between these two situations knowing the actual page ID (here: BS_BP_CONTACT_PERSON). However it works only fine while creating or editing the Contact Person for a first time ( in a debug mode I see there is BP_CENTRL used), but when I click the "display" link I can only see the BP_REL, BP_WPAD, WP_URL entities to be modified and I see no way to modify the BP_CENTRL ('s fields properties) entity. After refresh (F5) I can click "edit" and it is ok. again. Any tips?
Thank You, Łukasz.