NOTE: You seem to be creating a Vehicle, why are you trying to Submit that to the Inspection Table/List? Shouldn't you submit to the Vehicle List or Table? thats most likely the issue
If it says its required then you need to populate it.
Is it a lookup? Is it a string column on your List/Table?
Whatever you are doing, whatever place you are saving it, has this field (possibly the Primary Column) set as business required (if Dataverse or Required in SharePoint
Please share the code you are using, share the DataSource you are writing too, in the Tables/Lists configuration so we can see what columns are there and what columns are required.
The error itself is very straight forward, that means either you are submitting to the wrong list/table or you accidentally marked something as required, or you use the Primary Column in Dataverse which by default is required, or you used Title column in SharePoint which many times is marked as required.
Please share the Columns view in SharePoint or Dataverse so we can help.
