We are facing quite a unique issue as Stage update command is not loading values for Cross Cube measures. All the default scripts of IOP having "stage replace" or "load replace" and we cannot use it once the model is n PROD.
We are trying to figure out a way where IOP can handle incremental data using "Stage update" or "load update".
the reason we want to do update beacuse we are changing the status of loaded data to "loaded to IOP" and further only incremental data should go to IOP.
I dont understand why you need to migrate. Please ignore that.
Almost all IOP customers are refreshing their data using load-update and load-replace. What is your issue? You are expected to write scripts (daily, weekly, ..) and we provided examples of how to do that in samples model. Those scripts will refresh the data, calculate the cubes and submit them. Thats a standard process. I dont understand why you cannot do load-replace. If you get an incremental feed, then do load-update. If you get full feed, then do load-replace.
Please read the command line document in details. There are tons of details in there.