Transfer posting 541 with Ref P.O Item wise

Hi Every One,

While Doing Transfer posting mvt type 541 with Reference to Subcontract Purchase Order in MB1B.

The Components belong to all items in PO is appearing to issue.But in case issue PO item wise ,it fetching only first item Components only.

Example: PO number:123456 having line items are 10,20,30

Line item 10 has components abc

For 20 xyz

For 30 nyb

Now in Mb1b give mvt 541 and With Reference to PO and along with items as

PO number Item

123456 10

123456 20

system should fetch Components related to item 10,20 that mean

should display abc

xyz

But here displaying first item components only as abc .

In what case it fetch both item Components and what to do for that?