Error AP_ESI_COMMON 107 when assign value for custom field on Release event Outbound Delivery

Hi,

The error AP_ESI_COMMON 107 is only raised when I "Realse" Outbound Delivery and assign value for custom field on Event-BeforSave of Outbound Delivery Extension object.

It's ok when I click "Save" button.

Here my code on Event-BeforeSave of Outbound Delivery Extension

import ABSL;

this.EDI_Shipment_Date = "abc";

Can you please give me some ideas about this ?