SSRS : SUM of SUMs

Hello Experts,
I have a SSRS reports that displays weekly sales and Store inventory levels. In this report, I have used a calculated member named "Branch Stock Value". And its expression is:

Now, I would llike to use another calculated member that uses this BranchStockValue member. My desires calculated member expression is:

BranchStockValue / SalesValue

I get divide by zero or other null errors. But the final purposed result is really very easy.

I have also attached a screenshot that displays my report layout. For example for the first line Branch Week Cover value should be 12544.36 / 1656.39 =  7.57


Please help

Fields!Store_Stock_Level.Value *(Fields!PS.Value - ((Fields!PS.Value * Fields!VAT_Rate.Value)/100))

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weeklyreport.png