Hi
I did try the suggestion specified in the note to check only one of the two checkbox options in the PSA deletion variation but still continuing to experience the same issue.
I went ahead and developed a custom program that uses the FM RSSM_PROCESS_PSADELETE to delete these 3.x DataSource PSA Requests.
The interesting thing as I have mentioned before is that the standard variant is successfully able to delete custom 3.x DataSources that start with '8Z' but not the standard ones such as 80PUR_DS03.
Attached are screenshots of the detailed log.