Hi SME's
we have a make to order items ( no physical stock in the system ) in our project sales order comes on a daily basis , master planning batch job will ran only once daily and the production order and transfer gets created in the system , however for some of the sales orders we noticed that system is reserving inventory ( reserved physical ) thought there is no physical stock available in the system , please refer the below screen shot , im clueless how system is reserving inventory , can anyone please help me how to restrict this behavior , because of which master planning is generating planned production and transfer order for this sales order, we have to manually remove the reservation for such orders and run the MPS again , this is becoming quite challenging .
Note : we have allowed physical negative inventory for all the items , but it is not the case with other sales order items.

Thanks in advance
Naresh