I am getting error in oracle apex API that i am showing in apex page using raise_application_error

Error showing now as ORA-20001- ‘Sku is mapped wrongly for this order’

Currently i am getting the error message in apex screen along with ORA error message, but my requirement is to only show the error message which we got from Api not the ORA-20001

Expected output:

Sku is mapped wrongly for this order