BAPI issue BAPI_ALM_ORDER_MAINTAIN

Hi All,

I have an issue. The issue is, am using the BAPI 'BAPI_ALM_ORDER_MAINTAIN' to change the Requirement Quantity and add new component in the production order. but this BAPI is not working consistently and it returning the below message

Error reading the order header from the document tables

Error during processing of BAPI methods

Please help me to solve the issue.

Thanks in advance.

Regards,

Boobalan Subaraj