Table Structure Reference dependency is too coarse grain

Steps to Reproduce

1. In Excel, insert a Table in A1:B5 with Header (2 column, 5 rows)
2. In "Column 1",  enter 1, 2, 3, 4
3. In "Column 2", enter a formula "=[Column 1]"
4. load file into KEIKAI 5.5

Current Result

Check DependencyTable.getDirectDependents("A2") will see the dependents

B2, B3, B4, B5 (the whole column)

Expected Result

B2 only

Debug Information

Found when handle #KEIKAI-396

Workaround