Single Invoice with Multiple Deliveries

Hi Gurus

My Client would like to create a single invoice by entering multiple delivery nos. in VF01 transaction.

I am aware that if the Payer, billing Date and Payment terms are equal then it shall allow you to create single invoice. But this is not happening.

I have also tried with creating a Routine in VBRK/ VBRP in copy Controls. My routine reads as follows.:

FORM DATEN_KOPIEREN_001.

• Header data

• VBRK-xxxxx = ............

• Item data

• VBRP-xxxxx = ............

• Additional split criteria

DATA: BEGIN OF ZUK,

MODUL(3) VALUE '001',

VTWEG LIKE VBAK-VTWEG,

SPART LIKE VBAK-SPART,

END OF ZUK.

ZUK-SPART = VBAK-SPART.

ZUK-VTWEG = VBAK-VTWEG.

VBRK-ZUKRI = ZUK.

ENDFORM.

But still it is of no use.

Could anybody please tell me whether I am missing something in the routine?

The Client would like the items in the delivery to appear one below another in the billing document while taking the reference of delivery document & also 1 billing document No. should be consumed while making the billing document from multiple deliveries.

Correct answer shall be suitably rewarded.

Thanks

Sunil