What table does VIBOBU link to when the object assignment type is 63

[stephenl1]

Hi, I am trying to determine the table joins from VIBOBU via VIBDOBJASS when the object assignment type OBJASSTYPE = '63'. I can find no master table that defines what the link from and to tables are in regard to each OBJASSTYPE. I have worked out many of the links, such as VIBDAO to VILMPE but I am stuck on the target table for links where OBJASSTYPE = '63'. This is defined in the relationships as an "Asset Assignment". Any help appreciated.

Thanks

Stephen