Datastream Data availaible via Excel Request-Table - But not via R-API

I have the following problem with some aggregated data variables which I want to download:

Take the variable "@:ETNTL30(A12UPC)" for example (this also holds for several other variables). If I try to download the daily data from beginning of 2019 until today via the Excel-Request table, I get an output. But if I try exactly the same with the R-API I don't get any output. On the other hand, it works with some other aggregated data variables, so my code seems to work basically.

Has anyone of you experienced the same problem and knows how to fix this issue or why it is like that?

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