S,
If I had an ad hoc need to extract a list of materials, and then feed the list into MASSD, I would use SE16 to get the data (/SAPAPO/MATLOTSZ using key LSZID from /SAPAPO/MATLOC). If you need assistance with this, any of your local developers should be able to help you.
I again remind you that the adverse symptoms arose after an upgrade. In addition to examining the current enhancements, you might also wish to raise a message with OSS.
Best Regards,
DB49