Tried Testing and is not showing child Schedule.
Ex. CRN. 51-142
This is Child Part in Assembly 51A-142 which again goes to 51A-139
The IDM serves the purpose for taking Manufacturing WO where we have certain issues. Even 51A-142 is not Working, but 51A-139 is showing Schedules.
Looks like only main schedules are working. But this IDM required for manufacturing Parts to show schedules for manufacturing Part within assembly.
Please review and let us know. 
Meanwhile, keep this ticket in open till we accept and results in test comes positive.