Enter a price unit

What causes this issue?

As valuation method, you have chosen "landed price, part-year" without,
however, defining the part-year.

How to fix this error?

Please specify the upper limit (last period) of the part-year in
question.

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.