It is observed that after upgrade or running pdm_configure that customization variables are missing from ddict.sch
You can confirm this by comparing older versions of ddict.sch to the current version.
CA Service Desk Manager 17.3 and 17.4
Version control and pdm_configure are both possible reasons ddict.sch is overwritten
To update ddict.sch in a AA environment:
1. Go to NX_ROOT\site folder on each server
2. Rename the existing ddict.sch name and extension (example ddictxyz.123sch)
Do not delete the original ddict.sch
3. Copy the working copy of ddict.sch from a similar environment to the NX_ROOT\site folder
4. Restart the SDM environment
Stop each application server, then stop standby server, then stop background server
Start background, standby, application servers
5. Run pdm_webcache -h