Act 120 requires specific statements depending on whether your product is a raw agricultural commodity or a processed food and whether it is packaged or unpackaged.
1. A packaged raw agricultural commodity, such as a separately packaged summer squash, must be labeled “produced with genetic engineering” if it is a product of GE. The manufacturer(s) who packages and labels the food is responsible for this label. See CP Rule 121.01(16); CP Rule 121.02(b)(i).
2. A raw agricultural commodity produced with GE that is not packaged, such as sweet corn sold by the ear, must be labeled on the shelf or bin where the produce is displayed with the statement “produced with genetic engineering.” The retailer is responsible for this label. See CP Rule 121.01(25); CP Rule 121.02(a)(i).
3. A packaged processed food, such as a box of cereal, must be labeled with one of the following statements if it is offered for retail sale in Vermont and contains ingredients produced with GE. The manufacturer(s) are responsible for this label.
Depending on the type of produce you are handling, if every item in the Invoice is a GE product then I don't see why a blanket statement would be an issue so long as that blanket statement states that ALL products in the Invoice are GE or May be Produced with GE. If there are some items in the invoice that are GE and others that are not, I can see how a GE statement next to each item would be required to avoid any confusion. It is the retailers responsibility to label an un-packaged raw agricultural commodity, so I'm sure you'll hear from them if your system isn't working for them.