a help required

hello experts,

Iam rahul ,and my module is sap basis,but i want some help

actually my colegue is asking for certain thing to do ie..in a tcode vf01>> when creating the sales order>> there is a screen with factory innvoice >>item data>>condition. in that screen ,there the manually data is been inserted ,but the manual data should not be allowed , how can we do this screen to be only in a diplay mode

if this is possible to do be help me out in solving the peoblem