Hi Hariny,
In the SAP standard coding, the field Fixed value date(VBRK-VALDT) is filled from the
sales order (VBKD-VALDT):
Include LV60AA93
FORM vbrk_vbrp_fuellen.
* Fuellen Fakturakopf
MOVE-CORRESPONDING vbkd TO vbrk. <<<
If in your case the field VBKD-VALDT is empty in the sales order,
and "randomly" filled in the invoice, this would mean it's hight possible that modifications
(user-exit, copy-routine) are active with own customer-own programmed logic, which are
responsible.
Regards,
Alex