possible to change decimal place setting for a particular Screen

Hi Experts,

Is it possible to change decimal place for a particular screen in SAP B1, for example in Purchase order there is a quantity field with decimal places 2..we can change the decimal place to 4 or more by changing in general setting, but doing so will affect all quantity fields..is it possible to change the decimal place for PO as 4 for purchase order alone with out affecting other screens

regards

Pradeep