Table doesn't calculated if more than one field value selected

[kaanerisen]

Hi everyone,

I need help to solve a problem that I faced.

I have a data table:

Validate Month	Forecast Month	Value
6	6	885,20
6	7	1.528,19
6	8	7.529,00
6	9	8.014,50
6	10	5.014,50
6	11	5.514,50
6	12	2.514,50
7	7	1.500,00
7	8	6.377,41
7	9	6.788,66
7	10	4.247,52
7	11	4.671,04
7	12	2.129,90

What I need is:

User can define a forecast look up month by using variable. For example if the user select 3, then the table above should look:

Validate Month	Forecast Month	Value
6	7	1.528,19
6	8	7.529,00
6	9	8.014,50
7	8	6.377,41
7	9	6.788,66
7	10	4.247,52

I achived this by using this expression, but it works only one validate month is selected.

Sum({<[Forecast Month]={"=[Forecast Month]>[Validate Month] and [Forecast Month]<=[Validate Month]+$(vMonthLookUp)"}>}Value)

I attached a sample app. Any support anyone can provide is appreciated. Thank you.