Syncronize association between classes

I have class A mapped to Table A. And Similarly class B mapped to table B.
Between Class A and class B I have drawn aggregate association where Class A has Class B with cardinality 0…1 to 0…*.

While trying to generate code, I am getting following error …

‘please syncronise association between A and B classes(has)’

Can someone tell me what am I missing? I have clearly given all rolesnames as required.

Hi Santm,

Thanks for your post. Would you mind sending your project file for investigation? Thanks in advance!

*If you do not want the file to be accessed by public, please send your project file to

Best regards,
Lilian Wong

Thank you for the post.
Hi guys, Im a newbie. Nice to join this forum.