Why is my mandate's reference not accepted?

Avoid special characters (#, $, /, etc.) and choose the simplest reference possible.

 

Here are the authorised characters:
a b c d e f g h i j k l m n o p q r s t u v w x y z
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
0 1 2 3 4 5 6 7 8 9
 

IMPORTANT: please avoid the following signs: / - ? ( ) . , ' + Space.   

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