SAP MDG Custom Object - New Button Not Enable

Hi Experts,

I m trying to copy a custom development.

Scenario is mapping SAP Customer Code with External Account Code in a Z table.

I will copy the development then I will extend to an other Z table , I will be mapping SAP customer code with External ZZ Code

I have done all configs MDGIMG , there was a data model ZX mine is ZY.

USMD_OVP_GEN

When I change USMD_OTC from ZX_OTC to ZY_OTC, the button gets enable.

Test;

Test,

I have put Button "New 22" which seems fine , but there is no config for it. I just put for testing.

Where should I check?

Help will be greatly appreciated.

Thanks,

Ihsan,