VERIFIED SOLUTION i
While deleting a record from a table in Spectrum Spatial Analyst, 'SERVICE_ERROR Internal Server Error' message is displayed on the screen as shown in the following screenshots:
This has been observed for the tables having a white-space in their names. It is a defect in Spectrum Spatial Analyst 12.2 and the versions prior to it.
ResolutionUPDATED: December 7, 2018
It has been fixed with Spectrum Spatial Analyst 12.2 S01 patch. Applying this patch will resolve the problem and records can be deleted from the tables having a blank space in their name.