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Hallo - at first thanks for this great tool.
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Question: In which expression/variable can i get the result of the counting in read_data procedure?
i tried several like {var:read_data59.gruppe1.anzahl} but that doesnt work.

perfect - this works fine.
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Another question: how can i calculate with this?
Eg left places: 170 - {var:read:data_59} results text and not the numerical value

use the PHP syntax in a PHP action:

echo 170 - (int)$this->get("read_data59");