In order to break backreference texts, you have to rescript the title object:
Add some intelligent hotspots, which will define the width of the textblock.
This width has to be added to the "textblock" width parameter, this way it will be possible to split each reference so it appears on separate lines (Sy_RichTextType, nonBreaking, width).
Afterwards probably the autotext's text
"<BACKREFSHEETNUMBER_R><DUMMY><"+ gs_backref_separator + ">" + AC_BackReferenceGUIDList[1]
has to be rewritten because of prior changes into RICHTEXT2.