Error while extracting data; cannot find leading time stamp

What causes this issue?

The delta load of the current data source is dependent on the delta
extraction of the leading data source. The time stamp record of the
leading data source must derive selection criteria and date/time
restrictions from the time stamp.

System Response

The system cannot find the time stamp of the leading data source in
table BWOM2_TIMEST.

How to fix this error?

To be able to use the current data source, reset the time stamp of the
leading data source by doing one of the following:
Initialize delta processing of the leading data source
Choose update mode "S" (simulation of delta init)

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.