1208524 - Error: 'The function cannot be used because it must be evaluated later', display in Crystal Reports

• Error when saving a formula.
• When checking a formula, Crystal Reports returns the error:
  
  "The function cannot be used because it must be evaluated later"
    
   
    
  
  What causes this error, and what does it mean?

• SAP Crystal Reports 2011
• SAP Crystal Reports 2013
• SAP Crystal Reports 2016 

1. In Crystal Reports, create a report off any data source.
        
2. In a Record Selection Formula, enter something like:   
      
       Sum({Database Field A} >  {Database Field B}  
   
   
3. When trying to save the formula, it fails with the error:  "The function cannot be used because it must be evaluated later"

• This error occurs when trying to insert a second pass function into a Record Selection Formula, and a Record Selection Formulas is evaluated during the the first pass to translate the formula into a SQL Query, and therefore, it cannot contain second pass functions that aggreate values, like: Sum, Maximum, Minimum,... as well as functions like: Next, Previous, TotalPageCount, WhilePrintingRecords,...
              
• This error can also happen if you used the function 'WhileReadingRecords' in a regular formula to ensure Crystal Reports evaluates it during the first pass of the data, but then added a second pass function to this formula.
           
• For more information on how a report is process in Crystal Reports, see the SAP Knowledge Base Article: 
        
  2594391 - How is a report processed in Crystal Reports?

• Remove the second pass functions from the formula.

CR , KBA , BI-RA-CR , Crystal Reports designer or Business View Manager , Problem

SAP Crystal Reports 2011 ; SAP Crystal Reports 2013 ; SAP Crystal Reports 2016