It turns out it wasn’t designed to be used by library parts.
When AC_BackReferenceGUIDList is used in a special autotext – “guid” where separator is a string and guid is AC_BackReferenceGUIDList referring to the drawing title – then it is replaced with the autotext equivalent of the guids in AC_BackReferenceGUIDList[2-…] adding the separator between them.
That is the only possible use of it, single GUID’s can’t be written as autotext.
The user can select the referenced drawings after clicking Back Reference button in the drawing settings dialog on the Title tab. Theoretically you could filter AC_BackReferenceGUIDList in the parameter script, but that would interfere with this dialog.
Library Platform, Software Engineer