Текст относится к банковскому делу, речь идет о чеках. Вот что там сказано:

"The official value of the check is the amount written in words; this field of the
check is called “legal amount”. The amount written in numbers is supposed to be
for courtesy purposes only and is therefore called “courtesy amount”".

Собственно, вопрос: как перевести "courtesy amount" и "legal amount"?