Subsequent search results will be lost

What causes this issue?

You have selected an existing search result and want to enter different
selection criteria for it. As different objects could be selected, the
system will delete any search results which go further down the
hierarchy than your current class.

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?

If you want to look at existing search results lower down in the
hierarchy, do not leave the search result with function key F3. If you
only want to see the characteristic values, you can do this in display
mode via the menu option <LS>Extras -> Display char. values</>.

Error message extract from SAP system. Copyright SAP SE.