Diagnosis
You want to execute manual planning for a planning step in which'month' has been defined as the storage periodicity.
However, there is no suitable fiscal year variant for this storageperiodicity.
A storage periodicity is required in planning for the following:

• Breaking down formulas with period fields with column definitions that
are applicable for all fiscal years in a planning layout

• Applying of distribution keys to column definitions that apply to all
fiscal years

• Determining the first day in a period for currency conversion

System Response
You cannot enter manual planning for storage periodicity 'month'.

Procedure


• Maintain a suitable fiscal year variant or change the storage
periodicity for the relevant planning step in Customizing.