How to get all items in a batch?

Hi,

I need to get all the items in a batch in RDA in order to create a file name. This is what I'm thinking:

• the user will enter the batch number in data selection
• then in ER I need to use each returned item to create a file name.
• So, I need to get max number of items, loop through all items, get the item number, create a file name, such as: FILE-Item Number-JDate.pdf (FILE-12345-122045.pdf)

I know how to create the file name, but I can't figure out how to get the number for each of the returned items in the grid to use it in the file name. Any help it appreciated.