Which of the following cases suppresses the creation of billable items in SAP Convergent Invoicing?

CORRECT TEXT

Which of the following cases suppresses the creation of billable items in SAP Convergent Invoicing? Note: There are 2 correct answers to this questions.
A . The rating raided an error.
B . The quantity is zero.
C . The amount is negative.
D . The pricing logic ends in a free function.

Answer: A, D