Field help (BPSUVYCOD) 

The un-available period code is used to specify the periods during which a BP or a site is not available (annual closing period, for instance).

The un-available periods code is used to specify the periods during which a BP or a site is not available (annual closing period, for instance).
The supplier unavailability period is used to check that the theoretical order date of a purchase request does not fall within these periods. The theoretical order date of a purchase request is calculated using the requested date of the request minus the time necessary for the purchase.