No value field was assigned for all costs

What causes this issue?

Operating concern &V1& is active in costing-based CO-PA, and the cycle
&V2& was defined with the sender selection type "Total costs".
Therefore a value field must be assigned for the total costs. However,
no value field has been assigned for total costs in assignment line
&V4& of PA transfer structure &V3&.

System Response

No data is posted.

How to fix this error?

Assign one value field for the total costs in the PA transfer
structure, or assign fixed and variable costs to the same value field.

Error message extract from SAP system. Copyright SAP SE.