Error while loading data into BW (BW as Target) using Data Services

Hello,

I'm trying to extract data from SQL Server 2012 and load into BW 7.3 using Data Services. Data Services shows that the job is finished successfully. But, when I go into BW, I'm seeing the below / attached error.

Error while accessing repository Violation of PRIMARY KEY constraint 'PK__AL_BW_RE_

Please let me know what this means and  how to fix this. Not sure if I gave the sufficient information. Please let me know if you need any other information.

Thanks

Pradeep