I was creating a secondary index in a DSO but when activating it, activation failed giving me the above error.
I've found this discussion: http://scn.sap.com/thread/1539116 but is regarding ECC 6.0, not BW, so I suppose it's not helpful for me.
I've included as secondary index the infoobject 0DOC_NUM. There is an InfoObject named ZDOC_NUM_E as Key Object in this DSO, and I don't know how it was created, but the most probably is that it was created based on 0DOC_NUM (no idea if as template or as reference). I'm afraid it has something to do with this error.
Can someone help me?