I faced the same issue in scenario when I deleted BoM using change number on last date, BoM was not deleted from system and when i was trying to change BoM using change number today, system throwing msg that " Message no. 29060 BOM for material 83373 0001 not valid on 24.05.2016. Even I checked in STKO, deletion indicator was assigned but BoM was not deleted.. Though I could have created alternative BoM valid from today date. But I deleted BoM by using CS02 without change number then assigning deletion flag. After that , system allowed me to delete BoM completely.
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