When trying to set the MAX_PARALLEL_TASKS to a specific value with PUT_ATT, it will be ignored if "Generate at runtime" is selected in the Attributes tab.
This value works correctly when "Generate at execution" is selected.
Release : 12.3
Component : AUTOMATION ENGINE
As design : PUT_ATT is done at script generation.
When "Generate at runtime" is selected, the script generate is done AFTER the max_parallel checks.
More details available below :
https://docs.automic.com/documentation/webhelp/english/AA/12.3/DOCU/12.3/Automic%20Automation%20Guides/help.htm#AWA/Executions/obj_ExecStages_overview.htm?TocPath=Using%257CExecuting%257CExecution%2520Stages%257C_____0
As design :
https://docs.automic.com/documentation/webhelp/english/AA/12.3/DOCU/12.3/Automic%20Automation%20Guides/help.htm#AWA/Executions/obj_ExecStages_overview.htm?TocPath=Using%257CExecuting%257CExecution%2520Stages%257C_____0