Need some help adding 2 fields together

SUGGESTED

Hi all,

I need to add the Sum of 3% Parts ( which seems to be a sum at the Group 2 level) and 3% Freight but I cant seem to get them to add correctly.

Any help is greatly appreciated.

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Parts Extension
IF {AR_InvoiceHistoryDetail.ItemType}="1" THEN {AR_InvoiceHistoryDetail.ExtensionAmt} ELSE 0.00

3% Parts
{@Parts Extension}*.03

Sum of Parts Extension
Sum ({@Parts Extension}, {AR_InvoiceHistoryHeader.InvoiceNo})

Sum of 3% Parts
Sum ({@3% Parts}, {AR_InvoiceHistoryHeader.InvoiceNo})

3% Freight
({AR_InvoiceHistoryHeader.FreightAmt})*.03