Forecasting based on resource with multiple date ranges

Summary:

Hi Experts,

We have a requirement to forecast the resources on a project task. The forecast amounts need to be calculated based on the forecast start & end date. Initially, the forecast dates default to the task start and end dates.
After changing the dates for the resource to a different start and end date, I received the following warning.

I clicked "Yes" and continued adding the same resource again for a different start and end date.

System is throwing the following error

However, we are seeing the raw cost being populated, but we are unable to save the version.