Info structure & lacks the necessary structure

What causes this issue?

There are two possible causes for this error:
You have tried to create a planning hierarchy or a planning version.
You have tried to transfer data to Demand Management from an
information structure which does not contain the characteristic
"plant".

System Response

Cause 1
Either the specified information structure has not been successfully
generated or it has been changed in a way that is not compatible with
SOP.
Cause 2
It is not possible to transfer data to Demand Management without
reference to a plant.

How to fix this error?

Cause 1
RESET N1
Have your systems administrator do the following:
Check in Customizing for the Logistics Information System (the step
"Maintain self-defined information structures") that the information
structure has been successfully generated. If the information structure
has not been generated, it will not have been saved on the database and
will therefore not be accessible for planning purposes.
Ensure that the information structure has not been changed manually in
the ABAP/4 Dictionary.
Cause 2
Plan this material's data in an information structure which contains
the characteristic "plant".

Error message extract from SAP system. Copyright SAP SE.