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