When encountering this rejection code on a Type 86 entry with a dynamic product, it indicates that the Agency Processing Code is missing from the dynamic product.
To address this, open the rejected entry, review the messages to identify which item was rejected, and then click the edit button for that specific item to update the information.
Then click on the Dynamic Product and search for the AgencyProcessingCode, when we have this rejection it´s because instead of having a code we see the message "null" so we need to change this for the correct agency processing code depending on the item and HTS information.
In this case we change the "null" to "CCW", and once we make this change we can save the information on the entry and re send it as add.