SAP provided standard planning area to understand the each module capabilities. In real time it not worth to use and implement the IBP application.
Standard planning area (PA) is base to start the IBP application functionalities, consultants will copy the standard planning area and customize as per business needs.
Ex: SAP2 PA copied as ZSAP2. If any new functionality added it is applicable only for Standard planning areas later merge the SAP2 to ZSAP2 and test the new feature.
If SAP added new feature directly to ZSAP existing customized functionality may be impact, so some steps to be performed before merge the new features to ZSAP.
If any upgrade happens SAP recommended to reactivate the PA to added the new feature or apply OSS.
So consultant should be aware of which functionality SAP added and is there any impact on existing customized configuration, then copy ZSAP to another PA and merge the SAP standard PA and test accordingly.
Best Regards,
Lingaiah