OLAP does not allow for it.

Is the Use Indexes or Server for speed set to TRUE? This has to be set that way for the others to work.

• The Perform Grouping on Server option (in the Options dialog box) is enabled. For more information, see Enabling Server-side processing.
• The report uses some form of grouping.
• The report is at least partially hidden (at the very least, the Details section must be hidden). Since the server will process those sections that are hidden, the greater the portion of the report that is visible, the greater the amount of processing that must take place on the client side. If the Details section is shown, server-side processing will not be possible.
• In some cases, formula fields must be processed on the client side. If grouping is based on a formula field, or if a formula is used in a summary field, then all the records must be transferred to the client side before the formula can be evaluated. This will increase the amount of time required to run the report. Therefore, you may want to use SQL expressions as an alternative to formulas.

  Note:    Formulas used for record selection are an exception and can be pushed down to the server.

• For a report to be processed on the server, any running totals appearing in the report must be based on summary fields (since the data needed for the running totals will be pulled over to the client side).
• For a report to be processed on the server, the report must contain only summary fields of these types: Sum, Maximum, Minimum, Count.
• The report does not contain specified value grouping.