Crystal Reports Running total formula doesnt work

Question

WhileReadingRecords;
numbervar Samples;
if {product.sku}="card-sample" then
    Samples = Samples + {@num_qty};

Samples;   

Above formula always returns Zero, I know @num_qty has values in it and in some rows it has NULL, if I tried to evaluate NULLS using below code, it gives me an error too

if (not (isnull{@num_qty})) then    

Any ideas ??? Note: I'm trying this because, for my situation I cannot use CR built in Running totals

Answer 1

I believe your Samples variable assignment is wrong, and you need to use := instead of =, like this:

WhileReadingRecords;
numbervar Samples;
if {product.sku}="card-sample" then
    Samples := Samples + {@num_qty};

Samples;