When exactly are subscription requests created after source request is submitted?

Summary:

Content (required):

Now we consider the process going through the following steps;

1. Using EPM Automate importDimension command import csv with merge option
2. Create merge import Request
3. Kicked by merge import Request subscription request is automatically created to target viewpoint
4. From target viewpoint export data with EPM Automate exportDimension command

However, the subscription request is not always created because the import data doesn't match the condition of subscription setting (so the 3rd step would be skipped).

In this situation, we are trying to judge whether the 3rd step occurs or not on the system using Query Request REST API.

The problem is here.