To find object dependency, there are couple of utility programs you can use, such as RSDEPEND.
But there are also some SAP tables which could be used to find the object dependency -- some of the useful tables are CROSS, D010FINC, and D010INC.
CROSS tables will give you most of the dependency. It is a very useful table to look up for dependnecy objects. It's also very useful while working on a migration project.