Some of the initialization requirements have not been completed

What causes this issue?

Not all the initialization requests have been completed yet for this
DataSource, or there may be an incorrect initialization request.

System Response

No delta requests can be processed whilst there is an initialization
request that has not been completed.

How to fix this error?

Wait until the initialization request has finished, or delete the entry
for the incorrect initialization request from the corresponding display
in the Scheduler.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.