Hi Rachit Garg,
Thank you for your response.
No customizations have been done on this area. I have already invoked debugging on InventUpd_Estimated::inventUpdate. It has a condition checking if there was already a record on InventTransOrigin table and this is returning true although the record on SalesLine was newly created.
Just to inform you, we do have two companies and these companies are using the same format of number sequence for Sales Order. I'm not sure if this is part of the issue. Cause based on my analysis on the condition checking if there was already a record on InventTransOrigin it is checking a global cache.
Thanks,
AXDev