With time-phased materials planning, enter a planning cycle

What causes this issue?

You have selected MRP procedure "time-phased materials planning".
This procedure requires a planning cycle in the form of a PPC planning
calendar.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Please enter a planning cycle.

Error message extract from SAP system. Copyright SAP SE.