Message SAP WXP010 - Planning step & is not defined for manual planning

Diagnosis
You want to change or display plan data for planning step &V1& inplanning scenario &V2&.
No planning layout has yet been defined for this planning step. Itcannot therefore be used in manual planning yet.

System Response
Entry to planning was refused for this planning step.

Procedure
Enter a planning layout for planning stepV1.