On the "Import Template" window try to import the attached file BugImportCSV.csv
The file inserts a record on:
window "Invoice (Customer)" -> right
tab "Invoice" -> wrong!!
The importer is finding the Invoice tab from another window, not from the list of tabs pertaining to the selected window.
This must be happening with other dependent lists - I just found it with Window+Tab here.
This was probably fixed in another ticket - cannot be reproduced in actual 6.2 version