No field groups which are to be planned manually are displayed

What causes this issue?

You have not selected any of the field groups to be planned manually
for display on the initial screen. If you want to use these planning
parameters to enter and change planned values, you have to call up the
function "Select field group" each time you reach the overview or
period screen, in order to display field groups that you want to plan
manually.

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?

Change the settings you defined previously as required, or
Disregard this warning.

Error message extract from SAP system. Copyright SAP SE.