Field help (SHLDAT) 

Update 8.0.0 and higher:
SEEREFERTTO  This field can be accessed in the Expiry management mode of the product.
The expiry date, defined based on the reference date and shelf life, is displayed.

The expiry date is associated with a lot in stock. It indicates a use-by date for the stock of a product and is controlled in the issue movements:

The lots for products not concerned by expiry dates, have an expiry date forced to December 31st, 2999.