Save only positive numbers of List of Things in Workflows

[rotari]

Seems an easy task but getting errors all the time.
CSV is uploaded into type of data: Bankdata. Then I make changes to List of bankdata. some data is converted to numbers and saved. Now next step is another make changes to a list of Bankdatas. In variable “Ausgaben” i want to save only negative numbers from variable “Eur”. So I put Ausgaben = This Bankdata’s Eur. And in need an only when to save only when an Eur number ist negative.
Workflow

3. Step
   
   

Step 4

Step 4 Only when possibilities

Error Step 4

[adamhholmes]

You don’t do this with an only when condition… you need to filter the list of things you’re making changes to instead.