There is no way to load classification with RMDATIND, this has to be done in a extra step and is explained in 545626 - FAQ: Data transfer problems , too.
Nevertheless an interesting question why this BMM00-XEIC1 exists at all.
The history shows that this field came in 1994 with R2.1
And currently it is only used to generate the C in the maintenance status field VPSTA
I am not a 100% certain, but as we can read in the SAP note 545626 the classification is just an embedded functionality.
Classification has as well its own maintenance transactions, so I think loading of classification may not update the MARA-VPSTA field - contrary to the online transaction MM01 - hence you have to do this update already in RMDATIND.