Symptom
The OBServer node reports an error when an UPDATE statement is executed.
The following error message is returned:
Unknown thread id
Possible causes
When a PL object is invalid, an unpredictable error may occur on the debugging object. You can debug a PL object after it becomes valid.
Affected versions
All versions of client ODC and web ODC
Solutions
Solution 1
Move the pointer over the Alert icon to check why the current PL object is invalid.

Turn the PL object into valid as prompted. For example, you can recompile a PL object after creating the database objects that the PL object depends on.
Solution 2
If the PL object remains invalid, drop the PL object and create a new one.