Bug 35398: Fix LRP support for EDI orders with single items

Bug 35398: Fix LRP support for EDI orders with single items

This patch corrects a mistake in the original implementaiton of bug
20595 where we introduced support for the LRP segments being used to
automatically assign items ordered via EDI to stock rotation plans.

Signed-off-by: Sophie Halden <sophie.halden@cheshiresharedservices.gov.uk>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
(cherry picked from commit 783a58a9d3f26622450c7785182b175c71f50d5e)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>