====== RemoveLetters ======

The RemoveLetters () function removes all non-numeric characters from a string. 
**caution:** also special characters will be removed!

{{:images:sign_warning.png?nolink|}}**Note:** The function returns errors if the function parameter is zero. This means, for example, you have to check with a ruleset whether the data element exists and only then use the function.


==== Syntax: ====

<code>RemoveLetters('Number')</code>

==== Sample: ====

<code>RemoveLetters('00L01256523')</code>
returns 0001256523