Error while submitting the API - OKS_IMPORT_LINE_PUB.Update_Contract_Line

Hi

I tried to update a service contract line which is in 'SIGNED' status using the API - OKS_IMPORT_LINE_PUB.Update_Contract_Line. But I got the API return status as 'E' with the message - OKC_CONTRACTS_INVALID_VALUE (COL_NAME=sts_code). I have tried with the status code 'SIGNED' and  'ENTERED'. But still getting the same error. Below is the script which I used.

DECLARE

l_return_status VARCHAR2(10);

l_msg_count NUMBER;

l_msg_data VARCHAR2(1000);

l_msg_index_out NUMBER;

l_contract_id VARCHAR2(100);

l_line_tbl OKS_IMPORT_LINE_PUB.line_tbl_type;