Result Type: String
Definition: Returns a text string containing a hexadecimal representation of the 128-bit md5 hash of the given text. This is a reasonably reliable way of testing to see if there has been any change in a largish amount of data since you last checksummed it (because the checksum is small enough to store, being only 32 characters).
If you are iterating over data (detail lines of a transaction, say), you can add the previously calculated checksum by appending it to the input text (in this example, CS is a cell name inside a for loop in a report)
CS = Checksum(D.StockCode + D.StockQty + D.Gross + CS)