Red lines on import

[A.J. Bonnema]

Hey all,

While import OFX files (which I converted from csv) I regularly get red 
lines with the comment "Do not import (no action selected).

Most transactions are green and have the comment "new, transfer € 200,00 
to (auto) expenses:insurance:car". The account and amount represent an 
example.

My query is: What criteria does Gnucash use to determine whether a 
transaction should not be imported (i.e. the red lines).

Kind regards, Guus Bonnema.

P.S.
Package Info: I use a stock Fedora 23 (most recent version) with the 
following package info:

Installed Packages
Name        : gnucash
Arch        : x86_64
Epoch       : 0
Version     : 2.6.9
Release     : 1.fc23
Size        : 48 M
Repo        : @System
 From repo   : @commandline
Summary     : Finance management application
URL         : http://gnucash.org/
License     : GPLv2+
Description : GnuCash is a personal finance manager. A check-book like 
register GUI
             : allows you to enter and track bank accounts, stocks, 
income and even
             : currency trades. The interface is designed to be simple 
and easy to
             : use, but is backed with double-entry accounting 
principles to ensure
             : balanced books.