Please advise how to utilize the Rerunnable feature within Flowbuilder

Hello -

I am new to OATS and Flowbuilder.  I am developing a flowbuilder script that creates an invoice batch and a simple invoice.  I'd like to be able to rerun this script and have the batch name and invoice numbers be different for each run.  In my test data for these components the fields are set to be rerunnable and a question mark preceding the value.  I've also generated the OFT script with the flag 'rerunnable ' checked.  But when I run the OpenScript script these values are not appended with any additional values as I am expecting.  I'm assuming I've