SAP Message PX079 - Personnel number &2 is already assigned in client &1

Diagnosis In client &V1&, user &V4& is already assigned to the personnel numberV2 in the communication infotype (0105) at the time of theconversion. As only one user can be assigned to a personnel number, thesystem can not assign to user &V3& in accordance with the viewAssignment: User - Personnel Number (T513A). System Response The relevant table entry is not converted. Procedure If necessary, correct the assignment in the Communicationinfotype (0105).