ValidatePeriodsMasterJobDef via ESS REST API doesn't trigger child subprocess

Hi,

I'm trying to trigger the seeded ESS job ValidatePeriodsMasterJobDef using the ESS REST API (/ess/rest/scheduler/v1/requests).

The REST request successfully creates the parent ESS job, and it completes with Succeeded status. However, unlike the manual submission from Scheduled Processes, it never submits the child ValidatePeriodEss (RUN_VALIDATIONS) subprocess.

I have compared both executions:

• All submit.argument1 through submit.argument21 match the manual UI submission.
• The parent job correctly reads the Cost Organization and Cost Book.
• In the manual run, the log shows:
  • Submitting job request for RUN_VALIDATIONS subprocess
  • New Request ID submitted...
• In the REST submission, these lines are missing, and the job directly proceeds to the purge process.