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Indictors generating Zero

 

Hi,

I am trying to create an indicator of type number which gives me the sum of
element A and B Minus element C.
I will trigger a village once and get the number of Households and then
check weakly if they have built a toilet.

Form A Yearly:- Elements :- Number of Households (Option Those with Toliets
and Those without) -:--This element is taken during once but i will for the
next 4 weeks check if those without toilets have built a toilet.

Form b Weekly:- Element:- Number of HH that have built new toilet

Hence my inidicator:- Balance of HH without toilets = Number of HH (Without
toilets)-Number of HH that have built Toilets (Sum or aggregated over the
weeks)

The formula does not seem to get any result

Cheers

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