Process Control is totally dependent on the standard frequencies and timeframes provided by SAP in General Settings -> Key Attributes -> Maintain Timeframe frequencies/Maintain Timeframes. When creating custom timeframes, customers need to keep frequencies always active and timeframes always available if any task was previously created with a specific custom timeframe.

When a plan is created, it is dependant of the timeframe chosen. Everytime users open planner, all the tasks are validated according to the timeframe chosen on their creation.

Sometimes, An ASSERTION_FAILED dump is raised by the system highlighting class CL_GRFN_API_TIMEFRAME and method GET_FREQ when accessing planner.

If you face the symptom described above, you can check the following SAP note:

SAP Note: 1970216: ABAP Dump when accessing Planner

If it was not possible to find the missing or inactive timeframe, there is a wiki page which explains how to find it:

http://wiki.scn.sap.com/wiki/x/kIeoFQ

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