Signing Limit - API

Unfortunately there is no any API available to enter signing limit.

Is There A Method To Enter Signing Limits Other Than Through The Form? (Doc ID 171837.1)
fix: This must be done through the form. There is no supported API or alternate method which can be used.

Through form >
Payable Manager > Employee > Signing Limit

Else,

Do the direct insert to the base table ?
           --
          insert into ap_web_signing_limits_all
                                        (document_type
                                        ,employee_id
                                        ,cost_center
                                        ,signing_limit
                                        ,last_update_date
                                        ,last_updated_by
                                        ,last_update_login
                                        ,creation_date
                                        ,created_by
                                        ,org_id
                                        )
                                  values('APEXP'
                                        ,ln_person_id
                                        ,lc_cost_center
                                        ,ln_signing_limit
                                        ,sysdate
                                        ,fnd_profile.value('USER_ID')
                                        ,fnd_profile.value('LOGIN_ID')
                                        ,sysdate
                                        ,fnd_profile.value('USER_ID')
                                        ,ln_org_id                                     
                                        );         

Ref: http://ebsanil.blogspot.co.uk/2012/09/oracle-employee-signingapproval-limits.html