VBAK-AUTLF changed after sales order creation

Hello Experts,

I have the following issue that was raised by the user.

User says that the system is allowing partial delivery even though VBAK-AUTLF has been checked. I looked up the document changes and found that the VBAK-AUTLF was not checked initally at the time of the order creation and was changed to checked after two months. - Could this be the reason that partial delivery was allowed by the system? Or could there be another potential reason.

Please share your ideas.

Thank you,

Nathan