Function：BS01_MM_QUOTATION_CREATE create item quantity with ZERO

I used function： BS01_MM_QUOTATION_CREATE to create a RFQ，

but RFQ getting created without updating a QTY，The item quantity is ZERO.

I map this structure QUOTATION_ITEMS-TARGET_QTY and QUOTATION_ITEMS-QUANTITY

and also the structure QUOTATION_ITEM_SCHEDULES-QUANTITY.

Do I forgot to map any field?