Sub-Contracting

Hi Friends,

I have 4 materials. 3 semi finish and 1 finish. 2nd semi finished has to be sent for subcontracting. when i run MRP for the header material and save, then all the 4 materials get Planned orders. is this correct or i should'nt create planned orders for Sub-Contarcting material? please help me.

Thanks & Regards,

Santosh