Unable to Bulk Bill Sales Orders Due to Notice that At Least One Line Item Must Be Entered

If users encounter "Bill Sales order failed - You must enter at least one line item for this transaction.", consider that a sales order may have a Billing Schedule with Initial Amount and Amount of zero.

That being the case, users must review if there must indeed be a Billing Schedule and if there must be one,correct item line(s) and assign the respective amounts.