Loading Assignment Updates without replacing the Future scheduled update using HDL

Content

Hi Experts,

I have a requirement to load assignment details using HDL.

Goal: To load the Assignment details without replacing/overriding the existing Scheduled future update, eg: there is a assignment update which is going to be effective from 30 July. I want to load the assignment detail effective from today i.e. 24 July without overriding the 30 July update.

Problem: When loading the new assignment details it is overriding the future assignment update. 

We already tried updating the assignment details with end date eg: assume there is a future assignment update of 30 July in the system, if we load assignment details with Start Date: 24 Jul and End Date: 29 July, it is not overriding the 30 July assignment, but if we are loading the data without End Date it is overriding.