Add-on Issue on 9.0, PL 9

Hi,

We are facing an issue in SAP 9.0, PL 9, wherein we are not able to enter data in parent child relationship tables created by an add-on. At the time of add data, it shows "Invalid Field Name" error. We have also applied the PL 9.0 Hotfix, but still the issue remains. Kindly let me know how we can resolve the same.

Regards

Kapil