Scenario
Upon saving a Sales Order where Create WO column = True and Advanced Bill of Materials feature is enabled, users may encounter the error message: “You must enter at least one line item for this transaction”
Solution
Normally, this error is encountered when there is no Bill of Materials record that has been marked as Master Default on the Assembly Item record (Manufacturing tab > Bill of Materials sub tab).
To resolve, edit the Item Record and mark the Master Default checkbox for any Bill of Materials record.