externalAccount.accountNumber Allowed Special Characters

Character	Name
`+`	addition sign
`&`	ampersand
`'`	apostrophe
`*`	asterisk
`@`	at symbol
`:`	colon
`,`	comma
`$`	dollar sign
`=`	equal
`!`	exclamation mark
`ˋ`	grave
`>`	greater than
`^`	hat, circumflex
`{`	left brace
`[`	left bracket
`(`	left parenthesis
`\`	left slash
`<`	less than
`\|`	logical or
`#`	number sign
`%`	percent sign
`.`	period
`?`	question mark
`}`	right brace
`]`	right bracket
`)`	right parenthesis
`/`	right slash
`;`	semicolon
`~`	similar, tilde
	space
`"`	straight double quotation mark
`-`	subtraction sign
`_`	underscore
`¢`	cent
`¬`	logical not
`¦`	split vertical bar
`\|`	vertical line