job:  #8890  (Temporarily) change the schema to allow for one additional attribute value on MSG_M.  This attribute is marked as not persistent, but prebuilder seems to be passing it along anyway.  So, support it (benignly) downstream in the MC chain.  Hold off on adding it to mcooa.
job:  #8890  (Temporarily) change the schema to allow for one additional attribute value on MSG_M.  This attribute is marked as not persistent, but prebuilder seems to be passing it along anyway.  So, support it (benignly) downstream in the MC chain.  Hold off on adding it to mcooa.

lwriemen/mc,lwriemen/mc,cortlandstarrett/mc,keithbrown/mc,keithbrown/mc,leviathan747/mc,xtuml/mc,rmulvey/mc,keithbrown/mc,leviathan747/mc,leviathan747/mc,xtuml/mc,lwriemen/mc,rmulvey/mc,lwriemen/mc,cortlandstarrett/mc,leviathan747/mc,cortlandstarrett/mc,rmulvey/mc,xtuml/mc,keithbrown/mc,lwriemen/mc,leviathan747/mc,rmulvey/mc,xtuml/mc,keithbrown/mc,cortlandstarrett/mc,cortlandstarrett/mc,lwriemen/mc,rmulvey/mc,rmulvey/mc,leviathan747/mc,xtuml/mc,keithbrown/mc,xtuml/mc,cortlandstarrett/mc