problem with scheduling planned orders in MRP

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There is a problem with scheduling planned orders in MRP. SFG is assigned to the BOM of FG. No inhouse production time maintained in the material master of SFG & FG. routing maintained for both . In OPU5 scheduling & capacity reuiremnts tickmarked for detailed scheduling. Scheduling level - via detaied scheduling. Scheduling type - backward. Adjust basic dates , adjust dep. req. to order start set. In MD02 , scheduling is via ' lead time scheduling'.

My problem is the start date & time & finish date & time is same for planned orders of FG & SFG in the detailed scheduling tab of the planned orders. (Duration is same because of same capacity requirements on the same work centre. But how is the finish date same for both SFG & FG?)

(Capacity requirements are being generated.)

What could be the problem ?