Routing/Material Master Issue

[Schmidt, Jake (SN)]

WUGites,
I'm currently trying to "get" the material master # for a routing.  Most
routing information is in table PLKO.  When a user launches Tcode CA02
they can display a routing by using the Material number or the group
number.  PLKO only cares about the group number and group counter, but
somewhere there has to be the material number.  I believe I found in in
table MAPL.  However the material number is a key field in this table.
I can't add a keyfield to an attribute of my business object.
Does anyone have any advice on how to get the material number into my
workflow container so I can use it? I've tried just creating an element
in my WF container to include MAPL-MATNR but that doesn't work.  A group
# and a group counter # should equal a material master number.  I need
that Material number. 
Thanks!
Jake Schmidt
Spirit AeroSystems
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