Resource &1 not assigned at time point &2

What causes this issue?

No link was established between the iPPE resource and
<DS:GLOS.3526B5C8AFAB52B9E10000009B38F974>Overhead Cost Controlling</>.

System Response

The system cannot determine any costs for the activity in Short-Term
Production Costs.

How to fix this error?

In iPPE, go to the <ZK>factory layout</> and enter the <ZK>worker</> or
<ZK>operating facilities</> and choose <ZK>Load.</> Choose the
<ZK>Costs</> tab and enter a reference to the CO-relevant master data
<DS:GLOS.3526B5D5AFAB52B9E10000009B38F974>cost center</>/
<DS:GLOS.35289F0F9C4A1941E000080009927D9B>activity type</> or
<DS:GLOS.3526B66EAFAB52B9E10000009B38F974>business process</> by
selecting the corresponding data. The assignment of this CO master data
to the iPPE resource gives the iPPE resource a price (activity price)
which is then used both in costing and for confirmation.

Error message extract from SAP system. Copyright SAP SE.