I am trying to Update Task DFF using Visual Builder Excel Add-In

Summary:

I have downloaded the project and tasks in excel using VB Excel Add-In. I update the task DFF with a new value (which I can choose from LOV) but the upload fails with Row Not Found

Content (required):

I am using visual builder excel add in to download project tasks. There is DFF at task level that I am trying to update. It downloads successfully. I can see the value and the LOV for the valid other values. I choose one from the LOV. I can see the record is updated but when I choose to upload changes it fails with error