In transaction BP you maintain the field 'User Name' for a Business Partner in role Employee (BUP003). Once you save the systems issues a Transport Request for this action.
Also other changes to Business Partners related to HR roles might show this symptom.
Central Business Partner application
Transport Request; Transaction BP; BUP003; User name; Employee, Transportauftrag; Geschäftspartner; Benutzername , KBA , AP-MD-BP , Business Partner , BC-BMT-OM , Organizational Management , How To
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