What causes this issue?

The fiscal year variant &1& for the supplier capacity in DRP Customizing
is not the same as the fiscal year variant available in the database.

System Response

The system cancels the calculation.

How to fix this error?

Change one of the following settings:
Fiscal year variant for supplier capacities in DRP Customizing
Fiscal year variant of the time series used in the database
Both settings must have the same fiscal year variant.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.