External service set-up for LOTW

[GM4JXP]

I am struggling to setup Log4OM External Services for LOTW uploads of my /P QSOs. I have 10 different /P locations so far in one Log4OM database, corresponding to the same 10 locations in TQSL. I have one TQSL certificate for my /P callsign. In the Log4OM Configuration window there is a box for Station ID, the drop-down menu for which shows my Home plus the 10 /P locations. How should that be configured?

[G4POP]

Use the station ID applicable to the QSO's to be uploaded to LOTW