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The ZVG number does not contain leading zeros (see e.g. list). Moreover, the ZVG number given in an article might be compared to the Wikidata property that does not contain leading zeros, either. --Leyo22:35, 24 December 2021 (UTC)Reply
1. Thanks for the ZVG number (P679), explains why I could not find a "GESTID ID" in wd. (the list link is prohibitively slow, but I found a 750kB spreadsheet at [2]).
2. I see, no leading zero's in the definition (there). However, in the URL there are. For water
3. And, of course, the template code now has your name={{padleft:{{{ZVG}}}|6|0}}
So all in all my claim is not that far off. Quite reasonably, the temaplte should not produce an error when an editor uses the actual, working URL to add a source.
4. Forward: I propose that the template accepts leading zero's too, then simply removes them before padding into the right format. Why not. -DePiep (talk) 05:15, 25 December 2021 (UTC)Reply
I prefer to keep the same parameter value in Wikidata, de.wikipedia and here, i.e. the original ZVG number. Before, this parameter has never caused any issues. --Leyo21:01, 27 December 2021 (UTC)Reply