Accrual calculation is complete; check messages

What causes this issue?

Processing the calculation of imputed costs for the selected cost
centers is complete.
The numbers of the posted documents are displayed in the statistics

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

There are messages in the error log, however, which you should check by
using the function "Messages ...".

Error message extract from SAP system. Copyright SAP SE.