It’s an ID auto-generated and allocated to in-stock requests once in-stock request with Openlogi is made.
It’s created by one-based serial numbers and its composition is ‘UserID’-W’serial numbers’.
e.g. When the UserID is「RX579」and the in-stock request is the 19th to be made, the ID will be In-Stock ID: RX579-W0019
In-StockID will be used for the search on the screens such as [In-stock] > [Requesting] and [In-stock History] as well as distinguishing inbound items.