Charge Date

When raising an invoice from the ‘Pending Charges’ function/screen, is it possible to add the ‘Charge Date’ to the invoice in order to distinguish multiple items of the same Item Code/Description ? I can’t see that this field is available in the source data for any invoice report template for use within Report Designer. I have tried using the Invoice Date, but this just replicates a single date for each line.
Perhaps you could suggest the SQL that needs to be added to capture the data for this new functionality?
Thanks,
Quentin