Unsupported characters for custom fields
Some special characters are not supported in custom field labels. If any labels that were created in older versions of the product use these characters, then you must modify the labels so that only valid characters are used.
? | & | ^ | ] | + |
# | ! | * | { | = |
/ | ~ | < | } | ` |
( | @ | > | | | |
) | $ | ; | \ | |
, | % | [ | _ |