I have never been really happy with the Mandatory Logic setting of the Reservation Locator field in
Window, Tab & Field > Warehouse & Locators > Warehouse > Reservation Locator

Currently the Field can not be empty once a new warehouse has been saved: @M_Warehouse_ID@>0

Correcting an erroneous setting in a newly created warehouse requires the user to first create a Locator and select that as the Reservation Locator.

I find the setting rather unintuitive because it requires the user to set a Locator even when no locator is present for the warehouse. I propose to replace the current mandatory Logic setting
@M_Warehouse_ID@>0
with
@1|M_Locator_ID@>0

With this setting the field will only become mandatory after the first locator has been created.