sum of LAST field in Group

VICTORIA_007VICTORIA_007 Member Posts: 7
edited 2014-05-07 in NAV Three Tier
Please can you give me advice,
I want to sum the column in the "Inventory Posting Group" group. The column is calculate in the classic and show in the rdlc as =LAST(Fields!gDecAmountCost_Value.Value) in the details.
I keep to receive the error message (Picture1)[img][/img]

Thank You


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