Please help to find a solution to scheduling the Parent WO (1-st level) after Child WO (in 3 levels).
Level 4 raw materials are processed to obtain Level 3 pieces
Level 3 pieces are processed to obtain Level 2 elements
Level 2 elements are assembled finally to obtain Level 1 Final Products

BOM for Parent WO show correct relations at all 4 levels, but scheduling in Gantt starts for each of 4 levels same initial date and time.
The scheduling plan is working well just inside each level BOM between the work operations, not being linked to need time for manufacture for previous level articles.
Tanks a lot