No structure could be determined for internal activity &1 (&2)

What causes this issue?

The system could not determine a cost component split for the internal
activity with <DS:GLOS.activity_type>activity type &v1&</> of cost
center &v2&.

How to fix this error?

Check the master data for activity type &v1& of cost center &v2&. It is
possible that no <DS:GLOS.activity_price_calculation>activity price
calculation</> has been carried out for the cost center.

Error message extract from SAP system. Copyright SAP SE.