Field help (FIFDEV) 

If the box is not checked, no check is carried out on the FIFO date before entry is authorized for this location.
If the box is checked, a check on the FIFO date of the input product is carried out before storage is authorized for this location. The checks on the FIFO date are carried based on the duration defined at the level of each product ("Maxi FIFO gap" parameter in the Annex Product Record). They consider: the FIFO date of the input (Input Date) and the FIFO date of the oldest object on the location (Location Date).
For instance: let us consider (FIFO date of the incoming object) > (date of the oldest object on the location + duration of the maximum FIFO gap) => entry to this location is prohibited.