Supply Planning Firm flag update for a planned order using api

FBDI is currently not supported for supply planning planned order create / update. 
You are proceeding with rest api bulk payload based upload to create / update planned orders.

API Name: /fscmRestApi/resources/11.13.18.05/
payload:
{ "parts" : [ { "id" : 1, "path" : "/supplyPlans/1111/child/PlanningSupplies", "operation" : "create", "payload" : { "Item" : "1212", "Organization" : "ABC", "OrderType" : 5, "FirmQuantity" : "33", "FirmDate" : "2024-10-05", "SourceType" : 1 } }, { "id" : 2, "path" : "/supplyPlans/1111/child/PlanningSupplies", "operation" : "create", "payload" : { "Item" : "1212", "Organization" : "ABC", "OrderType" : 5, "FirmQuantity" : "22", "FirmDate" : "2024-09-28", "SourceType" : 1 } } ] }

we have around >2 Million Planned orders to Create / update in supply plan.
will be calling this api for each item - Org and plan horizon dates combination in parallel. 
Can you please let us know if you see any issues on above approach.