Post Upgrade from Apps 9 to Apps 10

MRP planned demand lines from SO REQs, are NOT visible in IFS10, as of initial data import

Running PMRP manually beings them back

But this would be a huge task to do for each project manually

It's as if it didn't bring across the previous SO REQ demands

Are such demands are not expected to come across as part of the upgrade?   Other demands are OK

Can anyone please advise.