if the Item is zero cost then the form should not allow us to enter the item

Hi,

This is in regards with the below requirement where the business wants to retrict the form where we enter the item.

Requirement is..... "If the Item is zero cost then the form should not allow us to enter the item."

Navigation : PS INV Setup --> Choose Org  --> Transactions --> Miscellaneous Transaction --> Date: DD-MON-YYYY and Type: Miscellaneous Receipt  then click on Transaction Lines button.

Now you will see Miscellaneous receipt form. Here we have to retrict the item if it has zero cost and the form should not allow us to enter the item.

Would appreciate if some one can help in this regard.