Following a AE upgrade, from 12.3.0 to 12.3.1, some Objects having added in Variables some Object Attributes like "$&JOB_TYPE#" fail with this error:
U00020315 Runtime error in object 'OBJECT_NAME', line '' : The system value '&$JOB_TYPE#' cannot be changed
If we remove the Variable $&JOB_TYPE# from the Object the Object runs OK.
In version 12.3.0, the Object does not fail but there is no value stored in the Variable as the log shows the following:
U00020206 Variable '&$JOB_TYPE#' was stored with value ''.
Release : 12.3
Component : AUTOMATION ENGINE