Usually, according to the following specific input information, different versions of the problem in exam can be defined:
on the items; on the products; no information. The first SLAP version assumes to have complete information on the SKUs
regarding the arrival and shipping times. The general structure of the problem is quite similar to an assignment problem
in which two items can be also allocated to the same position but not in the same instant. However, finding an optimal solution
is a time-intensive task, especially on realistic and large scale instances. Thus, by the years, some efficient heuristics
have been defined; we cite, for example, the Duration of Stay (DOS) based heuristic, described in [2].