EPM REST API Export Data request for Planning behaves unexpectedly

Hi,

This REST API request behaves unexpectedly.
https://docs.oracle.com/en/cloud/saas/enterprise-performance-management-common/prest/export_data.html

I was failing to override povMembers, because one of the dimensions must have multi-select. But I managed to develop a request body that works for multi-select, but parameter name is povGroupMember instead. As I already know from support, it's not possible to pass multi-select values for povMembers. Although, request body in second picture works fine.

Note: value in both is in one line, formatted it a bit so it fits in smaller picture.