In version EZP 4.3 the method "removeRelationObject" of kernel class datatype "eZObjectRelationListType.php" begins with these 3 lines:

if ( $this->isItemPublished( $deletionItem ) )
{
return;
}

in EZP 4.2 were

if ( eZObjectRelationListType::isItemPublished( $deletionItem ) )
{
return;
}
this has broken compatibility with DataImport Extension 1.5 (latest) class ImportOperator.
From my point of view this method could be decalred static and reverted as it was in 4.2 for first 3 lines.
thanks

Steps to reproduce

Use DataImport extension to import datarelationlist more than once.