Calculation is not possible; neither inputs nor outputs exist

What causes this issue?

You are attempting to calculate a formula for which no inputs or outputs
have been specified yet.

System Response

Calculation of this formula is not possible and is terminated.

How to fix this error?

Enter the required data and start calculation again.

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.