SAP Message WXP234 - Target planning step &1 is not defined in planning scenario &2

Diagnosis
You want to defined planning step &V1& as the target for a link.However, this planning step has not been entered yet in planningscenario &V2&.

System Response
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Procedure
Enter planning step &V1& in the maintenance for planning step &V2&.This planning step can then be used as a target planning step in alink.