In SE16, after you give the SO num & press F8 to execute, select Settings --> List format --> choose fields. In the popup selection screen check if SO num field VBELN is selected or not. If not, select the SO num & other required details to display.
Is your question why there is a no sales doc num when you create untill save?
If yes, here is the answer: In sales order prog MV45AFZZ, there are 2 exists. Sales doc prepare user exit & sales doc save user exit. When you create a sales order, save doc prepare user exit will be called & no data will be updated in the database tables like VBAP & VBAK.
When you click on save, only then save user exit will be called & data updated in DB tables. This is the reason why a sales doc num is generated only upon save but not when you create a sales order.
Sales order num that is a running num in VBAK table basing on the num range that is assigned to the order type.
I found the issue.. The issue was due to when a sales order is deleted in VA02, the process was updating all the tables expect the VBAP table which has line item details without VBELN.
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