Check the following data in MMR , Check what availability check , strategy group you have maintained, in MMR. Secondly it is happening only for few sales orders then check what where the materials you have entered in those sales orders where the requirement type is coming and also check what is the material you have entered in the sales order where the requirement type is not coming. Also check the item categories of those sales orders
In t code OVZI requirement types are assigned to item category and MRP types and there is a field called origin of Requirement type in sales transactions
This t code you need to check
For certain orders only you are having this problem
Those materials item categories and MRP types needs to be checked
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