Place the cursor on a selection version or initial list

What causes this issue?

It is not possible to double-click on this entry.

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?

Place the cursor on a selection version or initial list.
If the data selection has already taken place, when you double-click on
a selection version or initial list, the system displays the selected
data. Otherwise it starts the selection with the respective variant.

Error message extract from SAP system. Copyright SAP SE.