Cannot send PO Line attachment to supplier due to special characters in filename.

Summary:

Cannot send PO Line attachment to supplier due to special characters in filename.

Content (required):

Additional requisition information in smart form is entered in information template, and those details flow to purchase order, and has to be sent to supplier. When click attachment icon in purchase order line, the filename contains special characters like equal and double underscore. This requires PO change order to perform manual correction of filename in attachment. Then only supplier email receives one zip attachment and has both PO pdf and text file that holds additional requisition information. What is the way to get rid of manual correction of attachment filename in PO and hence avoid change order.