This function returns the SystemPartner's stored ILN to the transferred GLN. \
The second argument can be an Auto-Add-Value (True, False). If True is specified, the ILN is created again if it does not exist.

SystemPartnerLocationBackendReference('GLN')

SystemPartnerLocationBackendReference('GLN', 'AutoAdd')

SystemPartnerLocationBackendReference('GLN', 'AutoAdd', 'location name')

If the GLN is not found and AudoAdd is set to true, a new location is created under the default system partner with the “location name”.

SystemPartnerLocationBackendReference('4035811990017', 1, 'Pranke GmbH')

If the location with GLN 4035811990017 does not exist, a location with this GLN is created at the standard system partner with the name “Pranke GmbH”.