question concerning table mode / vsum / automatic adjustments of indices

I mostly have the same application of using org tables.
I have (many) columns with numbers and want to see the sum in the last row.

See this little example:

        |-------+--------|
        | items | amount |
        |-------+--------|
        | a     |    0.5 |
        | b     |    0.0 |
        | c     |    0.5 |
        |-------+--------|
        | sum   |     1. |
        |-------+--------|
#+TBLFM:    @5$2=vsum(@2..4)

Having the cursor on the row with "c"
and pressing <M-S-DOWN> I get this:

        |-------+--------|
        | items | amount |
        |-------+--------|
        | a     |    0.5 |
        | b     |    0.0 |
        |       |        |
        | c     |    0.5 |
        |-------+--------|
        | sum   |     1. |
        |-------+--------|
#+TBLFM:    @6$2=vsum(@2..@5)

everything is adjusted correctly!

Now I want to add a row after "c". Being on the row below "c"
when I press <M-S-DOWN> I get this:

        |-------+--------|
        | items | amount |
        |-------+--------|
        | a     |    0.5 |
        | b     |    0.0 |
        | c     |    0.5 |
        |       |        |
        |-------+--------|
        | sum   |     1. |
        |-------+--------|
#+TBLFM:    @6$2=vsum(@2..@4)

which is not what I want. I want "@5" as in the case before.
Is this a bug or a feature? How can I get what I need?

Thanks!

Rainer

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