How do I setup inventory to display error message while selling an rate is Zero ?
Goto setup > configuration >Innoventry settings
then scroll down the bar ,here you can see the question
What if we are are not set Rate to an Item?
there are 3 options present you need to select an appropriate option
options are ,
1.Show an error and do not allow any transaction for zero rate.
2.Show a warning and allow the transaction for zero rate.
3.Ignore and allow transaction for zero rate.