LorenzGL - it's always better to open a new Topic than change the subject of a running topic completely - as others will most likely not benefit from this discussion. It also detracts from discussion on the original topic.
Anyway, since this topic is already corrupted, I believe this also works: <$set name="fieldValue" filter="[[TiddlerA]get[text]removeprefix[prefix]get[fieldname]]"> <<fieldValue>> </$set> -- You received this message because you are subscribed to the Google Groups "TiddlyWiki" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/tiddlywiki. To view this discussion on the web visit https://groups.google.com/d/msgid/tiddlywiki/748c6c91-0546-402f-9ddb-58e503658be4%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.

