https://userapps.support.sap.com/sap/support/knowledge/en/2860080
2860080 - How to delete incorrectly assigned relationships between PERNRs and Central Person ID...
A PERNR has been incorrectly assigned to an existing CP ID resulting in two PERNRs occupying the same CP ID A PERNR has been assigned to multiple CP IDs when...
how to delete
https://userapps.support.sap.com/sap/support/knowledge/en/2449693
2449693 - HR-RU: Downloading form T-54 for multiple PERNRs | SAP Knowledge Base Article
You need to print form T-54 for big amount of employees, but you can see only one PERNR form after running program for amount of PERNRs Image/data in this KBA...