related-Transformation creates duplicates if ISBN is given as variant.

[TobiasNx]

While I was away the related-transformation was change to tackle some problems with multiple ids /subfield $w:
#1948
and PR without MR
1911e7b

I found that the changes improved the transformation where multiple Id exist for different variants but create duplicates if the ISBN is identical see:
e6e935b#r140286285

and here:

lobid-resources/src/test/resources/alma-fix/990367731740206441.json

Lines 60 to 67 in a308ef9

	"related" : [ {
	"id" : "http://lobid.org/resources/HT020445679#!",
	"note" : [ "Druck-Ausgabe" ],
	"isbn" : [ "9783451388798", "3451388790" ],
	"label" : "lobid Ressource"
	}, {
	"isbn" : [ "9783451388798", "3451388790" ]
	} ],

[dr0i]

Deployed next Monday.

[TobiasNx]

The duplicate is not provided anymore: http://lobid.org/resources/990367731740206441.json