Hi Abhishek,
Here is the diagnosis. Both UKM_TRANSFER_ITEMS and UKM_TRANSFER_VECTOR is updating the BP. But after creating an invoince from FB70 in DEV box, when I run SXMB_MONI to monitor the web service messages I do not get any message. But when I do the same in Sandbox there is response for the same.
Is this because of web services not working properly?