1 duplicate key error during insert into table

Dear Guru's

While upgrading the SAP_HR patch, I am facing this issue

Current level is SAPKE60455

Trying to apply patch - SAPKE60456

This is seen in the import log

-----------------------------------------------------------------------------------------------

Start import R3TRVDATV_512W_O ...

client 000:   1

client 001:   1

client 070:   1

client 080:   1

client 100:   1

client 320:   1

1 duplicate key error during insert into table T512T occured

End import R3TRVDATV_512W_O (with warnings)

-----------------------------------------------------------------------------------------------

Please help, thank in advance

R3trans is at version 6.19

Regards,

Omkar