No init. is green for DataSource &1 from source system &2

What causes this issue?

The prerequisite for the update of delta data in a DataStore object is
at least one successful initialization request (status <ZH>green
</>) from source system &V2& to DataSource &V1&.
The request must have the status <ZH>green</> in the monitor.

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?

In the monitor and scheduler, (menu entry: <LS>Initialization Selection
for Source System</>), check whether there are initializations for this
DataSource/source system combination.
Find out why existing initializations do not have the status <ZH>green
</>.
Use the QM action (button <PF>All </>on the monitor tab page <LS>Status
</>) to <ZH>green</> or carry out the initialization again.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.