i have an application where there are 2 forms

first is material requisition form (Material_requisition_form) with fields Requisition no. and  a subform items required (items_required) with fields

Item1

UOM

Demanded_quantity

2nd is material issuance note (Material_issuance_note) having a lookup field of material requisition form no. (as parameter) and subform Item Details (Item_details) with fields

Item1

UOM

Demanded_quantity

i want to fetch/copy material requisition form sub form (items_required) details to material issuance note sub form (Item_Details) if in material issuance form, material req. no. is same

please find form views in attachments

please help