the standard fucntion only support 2 decimal in purchasing order and other module is almost the same. User can not change the decimal prisision. This is very strange, I never saw any ERP system only can support 2 decimal. In PO form, there is another strange column 'price unit', it is the quantity unit for the unit price. But in most senerio at real business, we only foucus on the 1 unit to provide price.

So I suggest to enalbe more decimal in PO unit price and other number in system , like inventory quantity, PR price, invoice price etc.