Error in vendor creation API

Hi Experts,

I am trying to create a employee as supplier through API.

I am passing the employee id.Please conform if any other parameter is required to pass  API.  I am facing the below error.

"Supplier record cannot be updated.Either the Employee ID/Info is incorrect or the employee associated with this supplier is terminated"

I am using the sample below code.

DECLARE

   l_vendor_rec       ap_vendor_pub_pkg.r_vendor_rec_type;

   l_return_status    VARCHAR2 (10);

   l_msg_count        NUMBER;

   l_msg_data         VARCHAR2 (1000);

   l_vendor_id        NUMBER;

   l_party_id         NUMBER;

   ln_msg_index_out   NUMBER;