mrp_atp_pub.call_atp is not giving expected results

Hello Experts

I am making use of mrp_atp_pub.call_atp API to return ship date, group ship date etc. information for multiple item lines.

Say Item A and Item B are passed to the API for date derivation, the API returns only one of the items 2 times in the output.

Attached is the script and response. How to fix the issue to get the correct response?

Any input is greatly appreciated.

Thanks

Mirza Tanzeel