XS_DETAIL_MARK_REFERENCE_SYMBOL
Category in Advanced options dialog: Drawing properties
If you have set Symbol to Custom in the detail mark properties, Tekla Structures uses the value that
you have set to this advanced option to define the symbol to be used. For example,
if you enter xsteel@3, Tekla Structures uses the symbol number 3 in the
xsteel.sym symbol file.
This advanced option is model specific and the setting is saved in the options database. Reopen the model to activate the new value.