Sum + group by in webi report

Hi,

I've created a Bex query based on the infocube ZIC_C03 (Material Stocks/Movements). Now I'm creating a webi report based on this Bex query which

initially looks something like this:

Material Type | Material | Stocks

Type 1        Material1   1

Type 1        Material2   2

Type 1        Material3   3

Type 2        Material4   10

Type 2        Material5   25

Type 3        Material6   30

I want this report to look like this:

Material Type | Stocks

Type 1           6

Type 2           35

Type 3           30

I'm trying to sum stocks based on material type with no success, when I try to use SUM function in webi report I'm getting the #multierror message.

I'm not sure if the solution should be implemented in webi report or in Bex query designer.

I would really appreciate if you could help me with this.

Best regards.