Purchase order date change in APO With User Exit

We person 1 enhancement wherever we are blocking incoming Purchase orders for sometime with a validation array during PPDS optimizer tally with idiosyncratic EXIT APOCF006, Now one privation to alteration PO day successful APO utilizing this exit I saw it has Date and GR processing clip successful that exit, SAP Documentation says we tin create, change. delete PO  with the assistance of this idiosyncratic exit , So if one alteration the PO day with the assistance of this User exit past volition it people to changes to R/3 Side also? I don't privation people them successful R/3 broadside . I lone privation to person the alteration successful APO side.