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Modify to-call sequence name in pre-step?

Hi, I have the following problem: I have customized the "Call Sequence" step type, creating a custom step type that calls a sequence dynamically. The name of the sequence to call is represented by a step variable, which is edited in an edit substep.

This works fine.

Now I wanted to modify that step variable in a pre-step substep and found out, that obviously the step module is already "preloaded" (the to-call sequence name is evaluated) before the pre-step is executed. This results in a runtime error, something like "sequence not found".

What can I do?

Best regards,
Martin
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