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If I am using Counter instead of Random Variable I can access the matchNr.
I have tried to build it with a While and Loop Controller without success.

How to add some random there?

Thanks for any hints.

For example, if one has variables A1,A2 and N=1:

${A1} - works OK

${A${N}} - does not work (nested variable reference)

${__V(A${N})} - works OK. A${N} becomes A1, and the __V function returns the value of A1

Also it worth checking out How to Use JMeter Functions posts series, they clarify some use cases which aren't very obvious.

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