Astrex

Hi all,

I'm trying to add a astrex to a quantity to turn it into a code 39 bar code

I have used this formula before with crystal and it works fine
"*"+{stquem.users_text_field}+"*"



But with this one I now get a string required here message?
"*"+{stqeum.quantity}+"*"


Can anyone help please?

Thanks

Lee