MDG: How to adjust our custom code for note 2934693.

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Dear Expert,

I'd like to know which methods have to be adjusted for changes in note 2934693.

I followed the SAP MDG how-to guides for enhancing the data model (SAP How-To Guide_ Extend the MDG Business Partner-Node Extension (Reuse Option)).
To adapt changes in Note 2934694, I adjusted IF_MDG_BS_BP_ACCESS_HANDLER~READ_OBJECT_DATA according to the guide in this note.
Display BP works fine, but when changing to Edit mode, data was displayed incorrectly. 
Which methods should I change exactly?

Thank you
Yuko