### Steps to reproduce

1. Create recurring meeting with 4 occurrences

2. Open all 4 meetings

3. Edit recurring meeting to only have 2 occurrences

4. Try to delete meeting series


### What is the buggy behavior?

* The deletion dialog informs the user about deleting 2 meetings in the series, even though the open table shows 4


### What is the expected behavior?

1. Begin of the insertionIt will inform about all open meetingsEnd of the insertion Begin of the deletion TBDEnd of the deletion


### Screenshots and other files

<img class="image_resized op-uc-image op-uc-image_inline" style="width:467px;" src="/api/v3/attachments/312843/content">