yes, exactly, and it displays exactly the same error message.
But now, in the meantime, I found out that the max() function may not be what I would need for the use case.
The function would need to get the maximum value of all rows in a column, and then put this value in a new column.
And I would need to get the number 123 and put it into a new column in all rows for further calculation...
I am not sure if there is a way to do this at all with the Metabase gui. Maybe it would be better to do it in SQL - but then the users cannot click through to get to the individual records...