There are several reasons why you get this error message:
1) Use of a summary operation in your formula, or reference to a formula that uses a summary operation. In short, you cannot sum an summary.
2) Use the the next() or previous() functions in your formula.
3) Use of anything evaluated WhilePrintingRecords
4) Use of shared variables and subreport data.
Generally, you need to either use a running total field, a manual running total using the 3 formula approach (see faq149-182) to calculate your summary information.
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