EEWB uses customizing include (CI) provided by SAP to make extensions easy. These customizing includes are included in the People Centric UI and relevant database tables (For instance BUT000 if the Business Partner is extended). The extensions would appear automatically on the BP screens if People centric UI used. I guess the People Centric UI is not used in your case. The system simply does not know in which business partner screen, sub screen or field grouping the new field should appear. You may have to use BDT (Business Data Toolset) to include the field in the existing field group, sub screen or screen.
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