Where to setup Layer Number when using FIFO Cost method?

My client have to setup a new Inventory Organization and they would like to using Cost Method such as FIFO. So when they create Misc.Receipt transaction and entry unit cost as 10.
Next Misc.Receipt transaction user entry unit cost as 20, after Layer cost worker program run the system stamp Layer number as below;

1. unit cost 10 Layer number =1001
2. unit cost 20 Layer number = 1002

Is there any setup to start Layer number as 5001 please?

Thank you in advance