Hi Mel and Jimmy, Thank you for your advices. These gave me new insights. It is not already doing what I wish but with your advices I have a new view on the possibilities. So I will adapt my form in that way that the queries (retrieving data from the sharepointlist) always work. (filter data like in excelsheet). And If I want to add a new item on that same maindatasource, the preceding-sibling can be applied. I think I will not only need the option "only when the user inserts this section" but also like Jimmy suggested put some more rules.
At this moment when I only activate the "option" on the "repeating section" for entering "new items". The form keeps the filter settings of the first attempt to retrieve data and vice versa. With other words when you swich between views like - new item (with preceding-sibling) and - retrieve data, the visualized data gets a little bit mixed up.
So, I will work further on this and will let you know the outcome.
Regards,
Otto