2538815 - IBP: Planning Area Activation error: Output PL attr. must be a subset of the input PL attr.

You are either trying to activate your planning area (PA) in IBP OR you are running the Check Planning Area consistency check and you see errors like this in the log:

E - Calculation KEYFIGURE@PLANNINGLEVEL: Output PL attr. must be the union of the input PL attr.
E - Calculation KEYFIGURE@PLANNINGLEVEL: Output PL attr. must be a subset of the input PL attr.

SAP Integrated Business Planning (IBP)

IBP, Check has failed, Activation failed, attributes, planning level, calculation, integrated business planning, must be the union , KBA , SCM-IBP-CNF-ACT , Activation , SCM-IBP-CNF , Configuration , SCM-IBP-INV , Inventory Planning , Problem