Solution : https://service.sap.com/sap/support/notes/759096 (SAP Service marketplace login required)
Key words : 
~ftp/specific/usa_ccg/cpcc/note, solution programs imrb20l0, calculate 'unit % growth, prerequisites % growth rebates, cpcc environment, 'unit % growth, growth reason, ' rebates correctly, correct calculation, terms cpcc22
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