Table Control Issue

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My exact requirement is :

Through QM02 (Notifications) create a Credit Memo.

I have an enhancement point in program : FV45PFAP_XVBAP_LESEN

I created a Zenhancement here and added the logic as below:

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get parameter to get Notification Number.

Select MAterial and Quantity from table QMEL.

then I modified the VBAP structure data as below:

vbap-matnr = l_qmel-matnr.

vbap-zmeng = l_qmel-zmeng.

====

Nothing more than this.

This enhancement point is available in the PBO of SAPMV45A and screen : 4902

Now, when the control goes from QM02 to VA01 (Notification ->functions -> sales order -> create sales order)

my material and quantity could be seen on VA01 screen in the first row of table control.

When I hit enter button - nothing happens.

When I save - credit memo is created with No line item.

Ideally, when I press enter key - the line item is confirmed and the relevent information like desctiption, UOM etc comes automatically. This is not happening.

ANy idea??