SSRS BIDS 2008表达超过GROUPED BY栏的百分比

Question

See below image.

In the % column I need total % for each of the 3 categories for Days (Project,RFC,Support) for that particular month.

For example:

for the first service under 'Project' in April i would need (9.4/(9.4 + 0 + 1.8)) * 100

for the first service under 'RFC' in April i would need (0/(9.4 + 0 + 1.8)) * 100

for the first service under 'Support' in April i would need (1.8(/9.4 + 0 + 1.8)) * 100

This would give me total percentages for each category on days per month.

What is the expression i need to use in the 'expression' box in design view to cover all my services?

Second image (above) is the Expression I have tried to use but am getting #ERROR on all records

Answer 1

= Fields！Days.Value / Sum（Fields！Days.Value，“ Date_month_name”）