Read data not working

Hello!
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I have a form to save data to a database. It works great.
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But now I have two problems with the read data.
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1. The form is loading the first data in the database. But it should load the data where "haendler" is the value of the field "haendler".
2. I can't get the data in the from fields.
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What is wrong?
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Thanks for your help.
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Form:

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Debug:

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Read event:

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Display section:

Form field:

Hi modicus,
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You can check the MySQL query by copying and pasting it into PHPMyAdmin - it looks OK to me.
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You aren't loading the value from the haendler column so it's not clear if you have the correct record.
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I'm not sure that the input Value is correct as {var:read_data.data.aktion_titel} - from the Debugger output it looks like {var:data17.aktion_titel}
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Bob

Get rid of the model in the where conditions and in all the fields to retrieve., they're not necessary.
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And like GreyHead said you need to replace {var:read_data with the actual name of the read_data action and model. So it should be
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{var:read_data5.data17.aktion_titel}