Custom fields are not visible in screen maintain business partner.

[SAPSupport]

Unable to Add Custom fields in the Maintain Business Partner App

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[SAPSupport · Accepted solution]

The Maintain Business Partner app cannot support custom fields, For maintaining the custom fields use the Business Partner Fiori apps (Manage Business Partner Master Data, Manage Customer Master Data and Manage Supplier Master Data).

Refer this KBA for more details : Unable to Add Custom fields in the Maintain Business Partner App