Determine context value dinamically

Hi Gurus,
I have to develop a report where as input value the user sets the year and in the columns we have the calendar week and in rows several KFs.
Let say we have KF1 and KF2. KF1 is a ratio from the underlying infoprovider, Sales volume. KF2 is the average of KF1 for the last 4 weeks(not including the one in context).
So my concern is how could I determine dinamically the value for the week in the context of the calculation so I can get the values for previous weeks. Here you have an example:
Calendar week     2     3     4     5                         6 ......
Actual Sales           200 300 400   500                     250
Avg. actual sales
last 4 weeks                                         ((200 + 300 + 400 + 500) / 4) = 350
Thanks a lot in advance!

I´ve tried using four hiden ratios and restricting them using a replacementh path variable defined over the calendar week but it does not allow me to replace by the value of the characteristic. It only allows to do the replacement by a query or another variable.

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What do you mean by field-Y is not bound to any context?? I am sure you would have atleast bound the selectedKey property of the dropdown list with some attribute of the context.
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// Concatenate with "-" in between
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// wdContext.currentContextElement().setInputFiledValue(concatenatedValue);
Here I am assuming that the attribute which have bound to the inputfield and dropdown field are directly under the context node. If not then you have to get the values from a specific node. Do it like this:
// Get the value of the currently entered value of the input field from the attribute which is bound to the input field.
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// Get the value of the currently selected value of the drop down field from the attribute which is bound to the drop down field.
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// To get the value of the concatenated string.
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Determine context value dinamically

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