Hey there @CoMPaTech, @bouwew, @frenck, mind taking a look at this issue as it has been labeled with an integration (plugwise) you are listed as a code owner for? Thanks!

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plugwise documentation
plugwise source
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@bartkummel Thanks for reporting the issue.

I have some questions/requests.

What is the firmware version of your Adam?
What is the name of the new schedule?
Can you post the Plugwise diagnostics file in this topic?
Is the new schedule visible and working in the Plugwise App?
How many data-points / schedule-change-points are in the new schedule?

@bartkummel Update: can you please reload the Plugwise integration? Or restart HA?
After the reloading/restarting the new schedule should show up in the selection drop-down-list.
If you can confirm that this is the case, then I know how to fix the issue.

@bouwew Thanks for looking into this. I reloaded the integration and that indeed solved the problem. Do you still need me to answer the other questions?

No need for more info, I know what's wrong.
I'll create a PR to fix this issue during the weekend.

Perfect. Thanks in advance!