When updating a blanket line, you can update the Item field only if you change the status of the order to Planned, or the status is Ordered and you change the Blanket Quantity field to 0 (zero).
To delete a blanket line/release, either of the following must be true:
If the line does not have any releases, no logging activity occurs because the line does not have value.
The following activities create entries in the activity log:
When you change an EDI customer order level discount, the system creates a new EDI customer order item log record for each line/release item that has a status of Ordered.
Electronic Data Interchange (EDI) Overview
Errors That Stop Demand EDI CO Transaction Posting
Making Changes to an EDI Customer Order Line
Receiving an EDI Planning Order or Shipping Schedule (830 or 862)