Re: BI Source system already exist

I believe this is due to the fact that there is an entry called UG1CLNT200 present in the table RSSOURSYSTEM which is preventing you from creating the source system called UG1CLNT200 in Tx RSA1. I would try removing the entry called UG1CLNT200 from the table RSSOURSYSTEM using the view V_RSSOURSYSTEM in Tx SM30 and see if that helps.

Tx SM30 - V_RSSOURSYSTEM

Also check the tips given in the SAP note 1850890 - Source System ID not found

Regards

RB