External Acquisition of assets on internal order

I have configured all Transaction to enter Budget on Internal order through KO22 and i have configured the screen layout of AUC to set cost order mandatory for ACU Class and i have test it  working done if i created Miro Deepened On Purchase order if i exceeded the budget entered it will display message by Remaining  amounts . but if i create External Acquisition via F-90 it ignore the internal order has been entered [Automatically deleted internal order]

Regards

Emad Gamal