Not Able To Delete Init Selections

Hi Experts,

I am not able to delete init selection for a data source. I tried deleting it from scheduler, using FM RSS1_QUEUE_DELETED_IN_OLTP and even from RSA7 in source system. It is getting failed at runtime with Time_Out Error. After Time_Out Error it is also displaying message Initialization cannot be deleted in source system.

Can you please advise me some other way to delete init selection for particular data source.

Thanks