Product:
Planning Analytics 2.0.9.18
Microsoft Windows 2019 Server

Issue:

When running TI process that have worked before we get error random like this;

Error in process completion: Unable to save subset “computed subsetname here” in dimension “Version”

Possible Solution:

That the a new anti-virus software is installed, that blocks the TM1 TI process from delete old subset files in data folder.

If you have MS Defender, ask to exclude the data folder and subfolders from the scanning. E.g. d:\tm1\budget\data

The anti-virus software is running from folder C:\ProgramData\Microsoft\Windows Defender\Platform\4.18.23080.2006-0

More Information:

https://answers.microsoft.com/en-us/windows/forum/all/windows-defender-real-time-protection-service/fda3f73e-cc0a-4946-9b9d-3c05057ef90c

https://www.softeng.es/en/blog/microsoft-defender-for-endpoint-the-solution-to-protect-detect-and-respond-to-the-most-advanced-attacks/ 

https://code.cubewise.com/bedrock