I just checked, and it seems to be available only in 9.0. This should not necessarily stop you though.
If you can find a PC on which you can download and install the latest E1 9.0 StandAlone (the one with Update 2 already applied), you could take advantage of using the feature of creating a Zip file as the Save Location for an object.
- Save the R98403XB
- Transfer the resulting file to the "spec" directory of PC, i.e. C:\E812\DV812\spec if you will be logged into DV.
- From OMW, create a new UBE called R98403XB with the appropriate descriptions and usage codes to match the ones in 9.0.
- Do a Restore operation from OMW, and choose the file that you copied over.
- Examine the UBE in RDA. See if it fits your needs. If there are some other objects (like BSVW, DSTR, BSFN, etc.) that are needed, you can transfer those the same way.
- Take all due care to make sure you are not overwriting a messing up existing objects in 8.12.
Since you are already on Tools Release 8.98, the Save/Restore operation should run without problem.